# Liquidity Evaporation ⎊ Term

**Published:** 2026-03-17
**Author:** Greeks.live
**Categories:** Term

---

![A high-resolution cross-section displays a cylindrical form with concentric layers in dark blue, light blue, green, and cream hues. A central, broad structural element in a cream color slices through the layers, revealing the inner mechanics](https://term.greeks.live/wp-content/uploads/2025/12/risk-decomposition-and-layered-tranches-in-options-trading-and-complex-financial-derivatives.webp)

![An abstract image displays several nested, undulating layers of varying colors, from dark blue on the outside to a vibrant green core. The forms suggest a fluid, three-dimensional structure with depth](https://term.greeks.live/wp-content/uploads/2025/12/abstract-visualization-of-nested-derivatives-protocols-and-structured-market-liquidity-layers.webp)

## Essence

**Liquidity Evaporation** represents the rapid, non-linear reduction in the market depth available for executing trades without causing significant price impact. In decentralized derivative venues, this phenomenon manifests when the order book thins or automated market maker pools lose their ability to facilitate transactions due to a sudden withdrawal of capital or a sharp spike in volatility. It is the systemic vanishing of the counterparty, leaving traders unable to exit positions or hedge risk effectively during moments of peak market stress. 

> Liquidity evaporation functions as a phase transition where market depth disappears, transforming tradable assets into illiquid holdings.

The condition occurs when market participants ⎊ specifically liquidity providers and high-frequency traders ⎊ de-risk simultaneously. This behavior creates a feedback loop where price slippage increases, triggering further liquidations and exacerbating the original shortage of capital. The architecture of decentralized finance, while open, lacks the central clearinghouse support found in traditional venues, meaning that **Liquidity Evaporation** often precedes cascading liquidations and protocol insolvency.

![A three-dimensional abstract wave-like form twists across a dark background, showcasing a gradient transition from deep blue on the left to vibrant green on the right. A prominent beige edge defines the helical shape, creating a smooth visual boundary as the structure rotates through its phases](https://term.greeks.live/wp-content/uploads/2025/12/visualizing-complex-financial-derivatives-structures-through-market-cycle-volatility-and-liquidity-fluctuations.webp)

## Origin

The concept finds its roots in traditional market microstructure studies, specifically the observation of flash crashes and the failure of limit order books during periods of extreme turbulence.

Within digital asset markets, this challenge is amplified by the reliance on **Automated Market Makers** and decentralized lending protocols that operate with transparent, on-chain collateral requirements.

- **Market Fragmentation**: The dispersal of capital across multiple decentralized exchanges and liquidity pools prevents the formation of a unified, robust order book.

- **Collateral Procyclicality**: The requirement to maintain specific margin ratios forces automated liquidation engines to sell assets into thin markets, directly causing **Liquidity Evaporation**.

- **Incentive Misalignment**: Liquidity mining programs often attract mercenary capital that exits instantly when volatility rises, removing the underlying support for derivative instruments.

These structural origins demonstrate how the design of permissionless protocols creates a brittle environment where capital efficiency is prioritized over long-term stability. The absence of a lender of last resort necessitates a reliance on programmed, algorithmic responses that often fail when subjected to unforeseen, high-correlation market events.

![A series of smooth, three-dimensional wavy ribbons flow across a dark background, showcasing different colors including dark blue, royal blue, green, and beige. The layers intertwine, creating a sense of dynamic movement and depth](https://term.greeks.live/wp-content/uploads/2025/12/complex-market-microstructure-represented-by-intertwined-derivatives-contracts-simulating-high-frequency-trading-volatility.webp)

## Theory

The mechanics of **Liquidity Evaporation** are best understood through the lens of order flow toxicity and the mathematical constraints of constant product formulas. In an **Automated Market Maker**, the price of an asset is a function of the reserves within a pool; when reserves are depleted or unbalanced, the price slippage becomes exponential. 

| Parameter | Mechanism | Impact |
| --- | --- | --- |
| Slippage Tolerance | Defined trade size vs pool depth | Exponential cost increase |
| Liquidity Depth | Total value locked | Threshold for price stability |
| Delta Hedging | Automated market maker activity | Procyclical feedback loop |

The mathematical reality is that liquidity is not a constant; it is a dynamic variable sensitive to the volatility of the underlying asset. As realized volatility exceeds the implied volatility priced into options, market makers face significant inventory risk. To manage this, they widen spreads or pull liquidity entirely, creating a vacuum.

This is where the pricing model becomes truly elegant ⎊ and dangerous if ignored ⎊ as the delta hedging requirements of short option positions often force dealers to sell into a falling market, accelerating the very volatility they seek to hedge.

> The interaction between derivative delta hedging and thin order books creates a self-reinforcing cycle of price collapse and vanishing depth.

Occasionally, I observe how these digital market dynamics mirror the biological process of population collapse in ecosystems where a single keystone species ⎊ or in our case, a primary liquidity provider ⎊ is removed, leading to a sudden, catastrophic loss of functional complexity. The system, once vibrant and deep, becomes a hollow shell incapable of sustaining the activity required for price discovery.

![A close-up view presents an abstract composition of nested concentric rings in shades of dark blue, beige, green, and black. The layers diminish in size towards the center, creating a sense of depth and complex structure](https://term.greeks.live/wp-content/uploads/2025/12/a-visualization-of-nested-risk-tranches-and-collateralization-mechanisms-in-defi-derivatives.webp)

## Approach

Current strategies for mitigating **Liquidity Evaporation** involve sophisticated capital management and the implementation of circuit breakers within protocol design. Market participants now utilize **Delta-Neutral Strategies** and off-chain order matching to circumvent the limitations of on-chain execution. 

- **Dynamic Margin Requirements**: Protocols adjust collateral ratios based on real-time volatility metrics to prevent forced liquidations during periods of thin liquidity.

- **Concentrated Liquidity Provision**: Liquidity providers target specific price ranges to increase depth where it is most required, though this increases the risk of impermanent loss.

- **Institutional Hedging**: Sophisticated actors use cross-margin accounts to spread risk across multiple instruments, reducing the likelihood of a single-protocol liquidity drain.

The current approach focuses on creating defensive postures. Traders and protocols alike recognize that relying on a single source of liquidity is a fundamental failure in risk management. By diversifying venues and utilizing programmable liquidity buffers, participants attempt to insulate their strategies from the sudden, systemic removal of capital that defines this environment.

![A high-tech propulsion unit or futuristic engine with a bright green conical nose cone and light blue fan blades is depicted against a dark blue background. The main body of the engine is dark blue, framed by a white structural casing, suggesting a high-efficiency mechanism for forward movement](https://term.greeks.live/wp-content/uploads/2025/12/high-efficiency-decentralized-finance-protocol-engine-driving-market-liquidity-and-algorithmic-trading-efficiency.webp)

## Evolution

The transition from early, simplistic liquidity pools to modern, modular derivative protocols has fundamentally changed how **Liquidity Evaporation** is experienced.

Early protocols operated with low leverage and high transparency, yet they were susceptible to simple arbitrage exploits. Today, the landscape is characterized by high-leverage derivative instruments that require constant, high-speed liquidity to remain functional. The shift toward cross-chain liquidity aggregation and the development of **Decentralized Option Vaults** represent attempts to solve the fragmentation problem.

These systems attempt to pool capital more efficiently, but they also create new, hidden dependencies. If a vault strategy relies on a single underlying protocol for its yield, a failure in that protocol causes a massive, instantaneous liquidity withdrawal across the entire vault ecosystem. The evolution is not toward a more stable system, but toward a more interconnected and potentially fragile one.

![A detailed view showcases nested concentric rings in dark blue, light blue, and bright green, forming a complex mechanical-like structure. The central components are precisely layered, creating an abstract representation of intricate internal processes](https://term.greeks.live/wp-content/uploads/2025/12/intricate-layered-architecture-of-perpetual-futures-contracts-collateralization-and-options-derivatives-risk-management.webp)

## Horizon

Future developments in **Liquidity Evaporation** management will likely center on the integration of predictive AI agents capable of anticipating liquidity shifts before they occur.

These agents will manage capital across decentralized exchanges with a speed and precision that human-directed strategies cannot match.

> Future liquidity management will transition from reactive capital buffers to predictive, autonomous rebalancing agents.

We are moving toward a period where the protocol itself acts as a market maker of last resort, using governance-controlled treasury assets to stabilize markets during moments of acute stress. This represents a significant shift in the philosophy of decentralized finance, as it introduces a form of algorithmic interventionism. The ultimate success of these systems depends on their ability to remain adversarial and resilient, avoiding the trap of centralized failure points while maintaining the depth required for a truly global, permissionless derivatives market. 

## Glossary

### [Trend Forecasting Models](https://term.greeks.live/area/trend-forecasting-models/)

Algorithm ⎊ ⎊ Trend forecasting models, within cryptocurrency, options, and derivatives, leverage computational techniques to identify patterns in historical data and project potential future price movements.

### [Volatility Index Tracking](https://term.greeks.live/area/volatility-index-tracking/)

Analysis ⎊ Volatility Index Tracking, within cryptocurrency derivatives, represents a quantitative assessment of implied volatility derived from options pricing models applied to digital assets.

### [Realized Volatility Estimation](https://term.greeks.live/area/realized-volatility-estimation/)

Measurement ⎊ Realized volatility estimation involves calculating the actual historical price fluctuations of an asset over a specific period.

### [Stress Testing Scenarios](https://term.greeks.live/area/stress-testing-scenarios/)

Methodology ⎊ Stress testing scenarios define hypothetical market environments used to evaluate the solvency and liquidity robustness of crypto-native portfolios and derivative structures.

### [Trading Venue Fragility](https://term.greeks.live/area/trading-venue-fragility/)

Architecture ⎊ Trading venue fragility, within cryptocurrency derivatives, stems from the inherent complexities of system architecture and its capacity to withstand stress.

### [Perpetual Swap Contracts](https://term.greeks.live/area/perpetual-swap-contracts/)

Contract ⎊ Perpetual swap contracts represent a novel financial instrument within the cryptocurrency derivatives landscape, functioning as agreements to exchange cash flows based on the difference between a cryptocurrency’s current price and a predetermined swap price.

### [Decentralized Liquidity Solutions](https://term.greeks.live/area/decentralized-liquidity-solutions/)

Liquidity ⎊ Decentralized Liquidity Solutions represent a paradigm shift in how assets are traded and priced, moving away from centralized order books towards automated market makers (AMMs) and other on-chain mechanisms.

### [Leveraged Position Management](https://term.greeks.live/area/leveraged-position-management/)

Capital ⎊ Leveraged Position Management necessitates precise capital allocation strategies, particularly within cryptocurrency derivatives, where margin requirements amplify both potential gains and losses.

### [Decentralized Finance Risks](https://term.greeks.live/area/decentralized-finance-risks/)

Vulnerability ⎊ Decentralized finance protocols present unique technical vulnerabilities in their smart contract code.

### [Order Book Imbalance](https://term.greeks.live/area/order-book-imbalance/)

Analysis ⎊ Order book imbalance represents a quantifiable disparity between the cumulative bid and ask sizes within a defined price level, signaling potential short-term price movements.

## Discover More

### [Volume Synchronized Probability of Informed Trading](https://term.greeks.live/definition/volume-synchronized-probability-of-informed-trading/)
![A detailed close-up shows fluid, interwoven structures representing different protocol layers. The composition symbolizes the complexity of multi-layered financial products within decentralized finance DeFi. The central green element represents a high-yield liquidity pool, while the dark blue and cream layers signify underlying smart contract mechanisms and collateralized assets. This intricate arrangement visually interprets complex algorithmic trading strategies, risk-reward profiles, and the interconnected nature of crypto derivatives, illustrating how high-frequency trading interacts with volatility derivatives and settlement layers in modern markets.](https://term.greeks.live/wp-content/uploads/2025/12/algorithmic-trading-layer-interaction-in-decentralized-finance-protocol-architecture-and-volatility-derivatives-settlement.webp)

Meaning ⎊ A statistical model measuring the likelihood that trading volume is driven by informed participants.

### [Margin Liquidation Cascades](https://term.greeks.live/definition/margin-liquidation-cascades/)
![A complex abstract digital sculpture illustrates the layered architecture of a decentralized options protocol. Interlocking components in blue, navy, cream, and green represent distinct collateralization mechanisms and yield aggregation protocols. The flowing structure visualizes the intricate dependencies between smart contract logic and risk exposure within a structured financial product. This design metaphorically simplifies the complex interactions of automated market makers AMMs and cross-chain liquidity flow, showcasing the engineering required for synthetic asset creation and robust systemic risk mitigation in a DeFi ecosystem.](https://term.greeks.live/wp-content/uploads/2025/12/decentralized-options-protocol-architecture-visualizing-smart-contract-logic-and-collateralization-mechanisms-for-structured-products.webp)

Meaning ⎊ A self-reinforcing price drop caused by the forced, automated selling of leveraged positions as prices hit trigger levels.

### [Price Inefficiency](https://term.greeks.live/definition/price-inefficiency/)
![A complex metallic mechanism featuring intricate gears and cogs emerges from beneath a draped dark blue fabric, which forms an arch and culminates in a glowing green peak. This visual metaphor represents the intricate market microstructure of decentralized finance protocols. The underlying machinery symbolizes the algorithmic core and smart contract logic driving automated market making AMM and derivatives pricing. The green peak illustrates peak volatility and high gamma exposure, where underlying assets experience exponential price changes, impacting the vega and risk profile of options positions.](https://term.greeks.live/wp-content/uploads/2025/12/algorithmic-core-of-defi-market-microstructure-with-volatility-peak-and-gamma-exposure-implications.webp)

Meaning ⎊ A market state where an asset price does not accurately reflect its fair value or is inconsistent across venues.

### [Short Squeeze Mechanics](https://term.greeks.live/definition/short-squeeze-mechanics/)
![A precise, multi-layered assembly visualizes the complex structure of a decentralized finance DeFi derivative protocol. The distinct components represent collateral layers, smart contract logic, and underlying assets, showcasing the mechanics of a collateralized debt position CDP. This configuration illustrates a sophisticated automated market maker AMM framework, highlighting the importance of precise alignment for efficient risk stratification and atomic settlement in cross-chain interoperability and yield generation. The flared component represents the final settlement and output of the structured product.](https://term.greeks.live/wp-content/uploads/2025/12/multi-layered-protocol-structure-illustrating-atomic-settlement-mechanics-and-collateralized-debt-position-risk-stratification.webp)

Meaning ⎊ A market phenomenon where rising prices force short sellers to buy back positions, accelerating the price increase.

### [Market Maker Retreat](https://term.greeks.live/definition/market-maker-retreat/)
![A complex, multi-layered spiral structure abstractly represents the intricate web of decentralized finance protocols. The intertwining bands symbolize different asset classes or liquidity pools within an automated market maker AMM system. The distinct colors illustrate diverse token collateral and yield-bearing synthetic assets, where the central convergence point signifies risk aggregation in derivative tranches. This visual metaphor highlights the high level of interconnectedness, illustrating how composability can introduce systemic risk and counterparty exposure in sophisticated financial derivatives markets, such as options trading and futures contracts. The overall structure conveys the dynamism of liquidity flow and market structure complexity.](https://term.greeks.live/wp-content/uploads/2025/12/multi-layered-market-structure-analysis-focusing-on-systemic-liquidity-risk-and-automated-market-maker-interactions.webp)

Meaning ⎊ The withdrawal of liquidity providers from the order book during periods of extreme uncertainty to mitigate trading risk.

### [Fiat Devaluation Risk](https://term.greeks.live/definition/fiat-devaluation-risk/)
![A close-up view of a sequence of glossy, interconnected rings, transitioning in color from light beige to deep blue, then to dark green and teal. This abstract visualization represents the complex architecture of synthetic structured derivatives, specifically the layered risk tranches in a collateralized debt obligation CDO. The color variation signifies risk stratification, from low-risk senior tranches to high-risk equity tranches. The continuous, linked form illustrates the chain of securitized underlying assets and the distribution of counterparty risk across different layers of the financial product.](https://term.greeks.live/wp-content/uploads/2025/12/synthetic-structured-derivatives-risk-tranche-chain-visualization-underlying-asset-collateralization.webp)

Meaning ⎊ The risk that government-issued currency loses value due to central bank actions or fiscal mismanagement.

### [Rational Economic Behavior](https://term.greeks.live/definition/rational-economic-behavior/)
![A layered architecture of nested octagonal frames represents complex financial engineering and structured products within decentralized finance. The successive frames illustrate different risk tranches within a collateralized debt position or synthetic asset protocol, where smart contracts manage liquidity risk. The depth of the layers visualizes the hierarchical nature of a derivatives market and algorithmic trading strategies that require sophisticated quantitative models for accurate risk assessment and yield generation.](https://term.greeks.live/wp-content/uploads/2025/12/nested-smart-contract-collateralization-risk-frameworks-for-synthetic-asset-creation-protocols.webp)

Meaning ⎊ The assumption that market participants make logical decisions that maximize their own benefits and utility.

### [Supply Expansion Volatility](https://term.greeks.live/definition/supply-expansion-volatility/)
![An abstract visualization illustrating complex market microstructure and liquidity provision within financial derivatives markets. The deep blue, flowing contours represent the dynamic nature of a decentralized exchange's liquidity pools and order flow dynamics. The bright green section signifies a profitable algorithmic trading strategy or a vega spike emerging from the broader volatility surface. This portrays how high-frequency trading systems navigate premium erosion and impermanent loss to execute complex options spreads.](https://term.greeks.live/wp-content/uploads/2025/12/dynamic-financial-derivatives-liquidity-funnel-representing-volatility-surface-and-implied-volatility-dynamics.webp)

Meaning ⎊ Price instability resulting from sudden increases in circulating token supply, often due to vesting unlocks.

### [Expiration Volatility](https://term.greeks.live/definition/expiration-volatility/)
![A futuristic high-tech instrument features a real-time gauge with a bright green glow, representing a dynamic trading dashboard. The meter displays continuously updated metrics, utilizing two pointers set within a sophisticated, multi-layered body. This object embodies the precision required for high-frequency algorithmic execution in cryptocurrency markets. The gauge visualizes key performance indicators like slippage tolerance and implied volatility for exotic options contracts, enabling real-time risk management and monitoring of collateralization ratios within decentralized finance protocols. The ergonomic design suggests an intuitive user interface for managing complex financial derivatives.](https://term.greeks.live/wp-content/uploads/2025/12/real-time-volatility-metrics-visualization-for-exotic-options-contracts-algorithmic-trading-dashboard.webp)

Meaning ⎊ The heightened price instability and trading volume that occurs as a derivative contract nears its final settlement date.

---

## Raw Schema Data

```json
{
    "@context": "https://schema.org",
    "@type": "BreadcrumbList",
    "itemListElement": [
        {
            "@type": "ListItem",
            "position": 1,
            "name": "Home",
            "item": "https://term.greeks.live/"
        },
        {
            "@type": "ListItem",
            "position": 2,
            "name": "Term",
            "item": "https://term.greeks.live/term/"
        },
        {
            "@type": "ListItem",
            "position": 3,
            "name": "Liquidity Evaporation",
            "item": "https://term.greeks.live/term/liquidity-evaporation/"
        }
    ]
}
```

```json
{
    "@context": "https://schema.org",
    "@type": "Article",
    "mainEntityOfPage": {
        "@type": "WebPage",
        "@id": "https://term.greeks.live/term/liquidity-evaporation/"
    },
    "headline": "Liquidity Evaporation ⎊ Term",
    "description": "Meaning ⎊ Liquidity evaporation is the systemic, rapid reduction of market depth in decentralized derivatives, causing severe price impact and risk instability. ⎊ Term",
    "url": "https://term.greeks.live/term/liquidity-evaporation/",
    "author": {
        "@type": "Person",
        "name": "Greeks.live",
        "url": "https://term.greeks.live/author/greeks-live/"
    },
    "datePublished": "2026-03-17T11:24:59+00:00",
    "dateModified": "2026-04-05T20:30:45+00:00",
    "publisher": {
        "@type": "Organization",
        "name": "Greeks.live"
    },
    "articleSection": [
        "Term"
    ],
    "image": {
        "@type": "ImageObject",
        "url": "https://term.greeks.live/wp-content/uploads/2025/12/conceptualizing-automated-execution-pathways-for-synthetic-assets-within-a-complex-collateralized-debt-position-framework.jpg",
        "caption": "The visual features a complex, layered structure resembling an abstract circuit board or labyrinth. The central and peripheral pathways consist of dark blue, white, light blue, and bright green elements, creating a sense of dynamic flow and interconnection."
    }
}
```

```json
{
    "@context": "https://schema.org",
    "@type": "WebPage",
    "@id": "https://term.greeks.live/term/liquidity-evaporation/",
    "mentions": [
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/trend-forecasting-models/",
            "name": "Trend Forecasting Models",
            "url": "https://term.greeks.live/area/trend-forecasting-models/",
            "description": "Algorithm ⎊ ⎊ Trend forecasting models, within cryptocurrency, options, and derivatives, leverage computational techniques to identify patterns in historical data and project potential future price movements."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/volatility-index-tracking/",
            "name": "Volatility Index Tracking",
            "url": "https://term.greeks.live/area/volatility-index-tracking/",
            "description": "Analysis ⎊ Volatility Index Tracking, within cryptocurrency derivatives, represents a quantitative assessment of implied volatility derived from options pricing models applied to digital assets."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/realized-volatility-estimation/",
            "name": "Realized Volatility Estimation",
            "url": "https://term.greeks.live/area/realized-volatility-estimation/",
            "description": "Measurement ⎊ Realized volatility estimation involves calculating the actual historical price fluctuations of an asset over a specific period."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/stress-testing-scenarios/",
            "name": "Stress Testing Scenarios",
            "url": "https://term.greeks.live/area/stress-testing-scenarios/",
            "description": "Methodology ⎊ Stress testing scenarios define hypothetical market environments used to evaluate the solvency and liquidity robustness of crypto-native portfolios and derivative structures."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/trading-venue-fragility/",
            "name": "Trading Venue Fragility",
            "url": "https://term.greeks.live/area/trading-venue-fragility/",
            "description": "Architecture ⎊ Trading venue fragility, within cryptocurrency derivatives, stems from the inherent complexities of system architecture and its capacity to withstand stress."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/perpetual-swap-contracts/",
            "name": "Perpetual Swap Contracts",
            "url": "https://term.greeks.live/area/perpetual-swap-contracts/",
            "description": "Contract ⎊ Perpetual swap contracts represent a novel financial instrument within the cryptocurrency derivatives landscape, functioning as agreements to exchange cash flows based on the difference between a cryptocurrency’s current price and a predetermined swap price."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/decentralized-liquidity-solutions/",
            "name": "Decentralized Liquidity Solutions",
            "url": "https://term.greeks.live/area/decentralized-liquidity-solutions/",
            "description": "Liquidity ⎊ Decentralized Liquidity Solutions represent a paradigm shift in how assets are traded and priced, moving away from centralized order books towards automated market makers (AMMs) and other on-chain mechanisms."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/leveraged-position-management/",
            "name": "Leveraged Position Management",
            "url": "https://term.greeks.live/area/leveraged-position-management/",
            "description": "Capital ⎊ Leveraged Position Management necessitates precise capital allocation strategies, particularly within cryptocurrency derivatives, where margin requirements amplify both potential gains and losses."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/decentralized-finance-risks/",
            "name": "Decentralized Finance Risks",
            "url": "https://term.greeks.live/area/decentralized-finance-risks/",
            "description": "Vulnerability ⎊ Decentralized finance protocols present unique technical vulnerabilities in their smart contract code."
        },
        {
            "@type": "DefinedTerm",
            "@id": "https://term.greeks.live/area/order-book-imbalance/",
            "name": "Order Book Imbalance",
            "url": "https://term.greeks.live/area/order-book-imbalance/",
            "description": "Analysis ⎊ Order book imbalance represents a quantifiable disparity between the cumulative bid and ask sizes within a defined price level, signaling potential short-term price movements."
        }
    ]
}
```


---

**Original URL:** https://term.greeks.live/term/liquidity-evaporation/
