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Which of the following factors do not affect the rate of evaporation?
Temperature of liquid
Humidity of surrounding air
Depth of liquid
Surface of liquid
Depth of liquid
Evaporation is a surface phenomenon where liquid molecules gain sufficient kinetic energy to escape into the vapor phase. Because evaporation occurs only at the interface between the liquid and the atmosphere, the depth of the liquid body does not influence the rate at which molecules leave the surface.
Evaporation is a surface phenomenon where liquid molecules gain sufficient kinetic energy to escape into the vapor phase. Because evaporation occurs only at the interface between the liquid and the atmosphere, the depth of the liquid body does not influence the rate at which molecules leave the surface.
E=C(esтАЛтИТeaтАЛ) тАФ Simplified Dalton's equation for evaporation
esтАЛ=6.11тЛЕ10237.3+T7.5TтАЛ тАФ Magnus formula for saturation vapor pressure at temperature T
The rate of evaporation depends on the vapor pressure gradient between the liquid surface and the atmosphere, the ambient temperature, wind velocity, and the exposed surface area. Molecules in the bulk of the liquid do not participate in evaporation until they migrate to the surface layer, making the depth irrelevant to the flux density at the interface.
Evaporation is strictly a surface-dependent process.
Higher temperature increases the kinetic energy of molecules, leading to higher evaporation rates.
Higher humidity reduces the saturation deficit (esтАЛтИТeaтАЛ), thereby decreasing evaporation.
Wind movement removes vapor-laden air, maintaining a steep pressure gradient.
Facilitates the global water cycle (hydrologic cycle).
Provides cooling effect for water bodies and organisms.
Causes significant water loss in reservoirs and irrigation canals.
Reduces water availability for hydro-power and domestic use.
Hydrological modeling and water budgeting.
Design of reservoirs and estimation of irrigation requirements.
Industrial cooling tower efficiency analysis.
The rate of evaporation is directly proportional to the surface area exposed to the atmosphere.
Depth is irrelevant because the molecular escape only occurs at the air-water interface.
Option A: Temperature increases energy. Option B: Humidity affects the concentration gradient. Option D: Surface area increases the number of available escape sites.
C is correct тАФ Evaporation is a surface phenomenon occurring only at the liquid-gas interface, making it independent of the total depth of the liquid.
In competitive exams, remember that any parameter related to 'volume' or 'depth' is usually a distractor for surface-related phenomena like evaporation or surface tension.