The rate of evaporation increases when the

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The rate of evaporation increases when the temperature of water is high. High temperatures increase the energy of the molecules in the liquid and therefore increase the rate of evaporation. High air temperature also increases the rate of evaporation by imparting enough kinetic energy to some of the water molecules at the surface.
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10. What is meant by the vapor pressure of water in the atmosphere? It is the total pressure exerted by water vapor in the atmosphere. 11. What is meant by saturation with water vapor? It is the condition in which water contains the maximum amount of water vapor at a given temperature. 12. What is evapotranspiration ? It is the transfer of moisture to the atmosphere by transpiration from plants and evaporation from soil and plants. Measures of Humidity 13. What is absolute humidity ? Specific humidity ? Absolute humidity: the mass of water vapor in a given volume of air. Specific humidity: the mass of water vapor in a given mass of air. 14. What is meant by saturation vapor pressure? It is the maximum vapor pressure at a given temperature. 15. What determines the water vapor capacity of air? The water vapor capacity of the air is determined by the temperature, which determines the rate of vaporization of water. 16. Describe relative humidity , and explain what is meant by a relative humidity of 50 percent. Relative humidity is a ratio (expressed as a percentage) that compares the actual amount of water vapor in the air to the water vapor capacity of the air. A relative humidity of 50 % means that the air contains half of the maximum water vapor at that temperature. 17. What is the dew point ? The dew point temperature ? The dew point is the critical air temperature at which water vapor saturation is reached. 18. Explain sensible temperature . It is the relative apparent temperature that is sensed by a person’s body. Condensation 19. Under what circumstances can air become supersaturated ? When air in which the relative humidity is greater than 100 % but condensation is not taking place. 20. Explain the role of condensation nuclei in the condensation process. They are tiny atmospheric particles of dust, bacteria, smoke, and salt that serve as collection centers for water molecules. 21. What are supercooled water droplets? They are droplets of water that persists in liquid form at temperatures below freezing. Adiabatic Processes 22. Which cooling process in the atmosphere is responsible for the formation of most clouds (and nearly all clouds that produce precipitation)? The only prominent mechanism for the development of clouds and the production of rain is adiabatic cooling.
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23. What happens to the relative humidity of an unsaturated parcel of air as it rises? Why?
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