Evaporation

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Boiling is the process by which a liquid changes into a gas or vapor. It is a physical change, not a chemical one. Boiling occurs when the vapor pressure of the liquid equals the Atmospheric Pressure.

Condensation is the process by which water vapor in the air changes into liquid water. It is a physical change, not a chemical one. Condensation occurs when the water vapor cools and the air can no longer hold as much water vapor.

Sublimation is the process by which a solid changes directly into a gas or vapor without passing through the liquid state. It is a physical change, not a chemical one. Sublimation occurs when the solid is at a temperature below its melting point and the pressure is below its triple point.

Deposition is the process by which a gas or vapor changes directly into a solid. It is a physical change, not a chemical one. Deposition occurs when the gas or vapor is at a temperature below its condensation point and the pressure is above its triple point.

Dew point is the temperature at which the air is saturated with water vapor. At the dew point, the water vapor in the air will condense into liquid water.

Humidity is the amount of water vapor in the air. It is expressed as a percentage of the maximum amount of water vapor that the air can hold at a given temperature.

Relative humidity is the ratio of the amount of water vapor in the air to the maximum amount of water vapor that the air can hold at a given temperature. Relative humidity is often expressed as a percentage.

Specific humidity is the mass of water vapor per unit mass of dry air. Specific humidity is often expressed in grams of water vapor per kilogram of dry air.

Vapor pressure is the pressure exerted by water vapor in the air. Vapor pressure is a measure of the tendency of water molecules to escape from the liquid state and enter the gas state.

Latent heat of vaporization is the amount of heat required to vaporize one gram of a liquid. The latent heat of vaporization of water is 2260 J/g.

Evaporation rate is the rate at which water evaporates from a surface. Evaporation rate is affected by temperature, humidity, and wind speed.

Evaporation pond is a shallow artificial pond used to evaporate water. Evaporation ponds are often used to dispose of wastewater or to reclaim water from saline groundwater.

Evaporative cooling is a process that uses evaporation to cool air. Evaporative cooling is often used in hot, dry climates.

Evaporative transpiration is the combined process of evaporation and transpiration. Transpiration is the process by which plants lose water vapor through their leaves. Evaporation and transpiration are the primary ways that water moves from the Earth’s surface to the atmosphere.

Evapotranspiration is the sum of evaporation and transpiration. Evapotranspiration is the primary way that water moves from the Earth’s surface to the atmosphere.
Evaporation

• What is evaporation?
  Evaporation is the process by which water changes from a liquid to a gas or vapor.
• What causes evaporation?
  Evaporation is caused by the movement of molecules. The molecules at the surface of a liquid have more energy than the molecules in the interior of the liquid. This energy allows them to escape from the surface and enter the air as a gas.
• What are some examples of evaporation?
  Some examples of evaporation include the evaporation of water from a puddle, the evaporation of sweat from your skin, and the evaporation of water from a pot of boiling water.

Boiling

• What is boiling?
  Boiling is the process by which a liquid changes into a gas or vapor. It occurs when the liquid reaches its boiling point, which is the temperature at which the vapor pressure of the liquid equals the external pressure.
• What causes boiling?
  Boiling is caused by the movement of molecules. The molecules at the surface of a liquid have more energy than the molecules in the interior of the liquid. This energy allows them to escape from the surface and enter the air as a gas.
• What are some examples of boiling?
  Some examples of boiling include the boiling of water on a stove, the boiling of water in a kettle, and the boiling of water in a pressure cooker.

Condensation

• What is condensation?
  Condensation is the process by which a gas or vapor changes into a liquid. It occurs when the gas or vapor cools and the molecules slow down enough to form liquid droplets.
• What causes condensation?
  Condensation is caused by the movement of molecules. The molecules in a gas or vapor have more energy than the molecules in a liquid. This energy allows them to move around and spread out. When the gas or vapor cools, the molecules slow down and lose energy. This causes them to come closer together and form liquid droplets.
• What are some examples of condensation?
  Some examples of condensation include the condensation of water vapor in the air to form clouds, the condensation of water vapor on the outside of a cold glass of water, and the condensation of water vapor on the inside of a dehumidifier.

Sublimation

• What is sublimation?
  Sublimation is the process by which a solid changes directly into a gas or vapor without passing through the liquid state. It occurs when the solid reaches its sublimation point, which is the temperature at which the vapor pressure of the solid equals the external pressure.
• What causes sublimation?
  Sublimation is caused by the movement of molecules. The molecules in a solid have more energy than the molecules in a liquid. This energy allows them to escape from the surface of the solid and enter the air as a gas.
• What are some examples of sublimation?
  Some examples of sublimation include the sublimation of dry ice, the sublimation of snow, and the sublimation of salt.

Deposition

• What is deposition?
  Deposition is the process by which a gas or vapor changes directly into a solid without passing through the liquid state. It occurs when the gas or vapor cools and the molecules slow down enough to form solid crystals.
• What causes deposition?
  Deposition is caused by the movement of molecules. The molecules in a gas or vapor have more energy than the molecules in a solid. This energy allows them to move around and spread out. When the gas or vapor cools, the molecules slow down and lose energy. This causes them to come closer together and form solid crystals.
• What are some examples of deposition?
  Some examples of deposition include the deposition of frost on a window, the deposition of snow on a mountain, and the deposition of salt on a road.

Dew point

• What is the dew point?
  The dew point is the temperature at which the air is saturated with water vapor. At the dew point, the water vapor in the air will condense to form liquid water.
• How is the dew point calculated?
  The dew point is calculated by using the following formula:

Dew point = 243.57 – 17.27T + 0.6215T^2 – 0.0028T^3

where T is the temperature in degrees Celsius.

• What are some uses of the dew point?
  The dew point is used to predict the weather, to determine the relative humidity, and to calculate the amount of water vapor in the air.

Humidity

• What is humidity?
  Humidity is the amount of water vapor in the air. It is measured as a percentage of the maximum amount of water vapor that the air can hold at a given temperature.
• What are the different

• The process by which a liquid changes into a gas is called:
  (a) Evaporation
  (b) Boiling
  (CC) Condensation
  (d) Sublimation

• The process by which a gas changes into a liquid is called:
  (a) Evaporation
  (b) Boiling
  (c) Condensation
  (d) Deposition

• The process by which a solid changes directly into a gas without passing through the liquid state is called:
  (a) Evaporation
  (b) Boiling
  (c) Condensation
  (d) Sublimation

• The process by which a gas changes directly into a solid is called:
  (a) Evaporation
  (b) Boiling
  (c) Condensation
  (d) Deposition

• The temperature at which the vapor pressure of a liquid equals the pressure of the surrounding atmosphere is called the:
  (a) Dew point
  (b) Humidity
  (c) Relative humidity
  (d) Specific humidity

• The amount of water vapor in the air expressed as a percentage of the maximum amount of water vapor that the air can hold at that temperature is called:
  (a) Dew point
  (b) Humidity
  (c) Relative humidity
  (d) Specific humidity

• The mass of water vapor per unit mass of dry air is called:
  (a) Dew point
  (b) Humidity
  (c) Relative humidity
  (d) Specific humidity

• The pressure exerted by the water vapor in the air is called:
  (a) Vapor pressure
  (b) Humidity
  (c) Relative humidity
  (d) Specific humidity

• The amount of heat required to change 1 gram of a liquid into a gas at its boiling point is called the:
  (a) Latent heat of vaporization
  (b) Evaporation rate
  (c) Evaporation pond
  (d) Evaporative cooling

• The rate at which a liquid evaporates is called the:
  (a) Latent heat of vaporization
  (b) Evaporation rate
  (c) Evaporation pond
  (d) Evaporative cooling

• A man-made pond used to evaporate water is called a:
  (a) Latent heat of vaporization
  (b) Evaporation rate
  (c) Evaporation pond
  (d) Evaporative cooling

• A process that uses evaporation to cool a substance is called:
  (a) Latent heat of vaporization
  (b) Evaporation rate
  (c) Evaporation pond
  (d) Evaporative cooling

• The process by which plants lose water through their leaves is called:
  (a) Evaporation
  (b) Transpiration
  (c) Evapotranspiration
  (d) Deposition

• The combined process of evaporation and transpiration is called:
  (a) Evaporation
  (b) Transpiration
  (c) Evapotranspiration
  (d) Deposition

• The amount of water that evaporates from the Earth’s surface and from plants is called:
  (a) Evaporation
  (b) Transpiration
  (c) Evapotranspiration
  (d) Deposition