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Which of the following factors does NOT affect the rate of evaporation?
Humidity of the surrounding air
Surface area of the liquid
Temperature of the liquid
Colour of the liquid
Colour of the liquid
Evaporation is a surface phenomenon where liquid particles gain enough kinetic energy to escape as gas. The rate of evaporation depends on physical parameters like surface area, temperature, wind speed, and humidity, but it is entirely independent of the substance's colour.
Evaporation is a surface phenomenon where liquid particles gain enough kinetic energy to escape as gas. The rate of evaporation depends on physical parameters like surface area, temperature, wind speed, and humidity, but it is entirely independent of the substance's colour.
If you spread wet clothes out on a line (increasing surface area) or hang them on a sunny/windy day (increasing temperature/wind speed), they dry faster; however, the colour of the fabric does not change the physical energy required for water molecules to transition into the vapor state.
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RateтИЭHumidity1тАЛ
Evaporation occurs when particles at the surface of a liquid possess higher kinetic energy than the intermolecular forces holding them in the bulk liquid. Factors that increase the energy available or provide more space for escape (like temperature and surface area) accelerate this process. Conversely, high humidity increases the concentration of vapor in the air, hindering the escape of new molecules.
Evaporation is a surface phenomenon occurring at temperatures below the boiling point.
Higher temperature increases the average kinetic energy of molecules, leading to faster evaporation.
Larger surface area exposes more molecules to the air, increasing the likelihood of escape.
High humidity means air is saturated with water vapor, reducing the capacity to hold more, thus slowing evaporation.
Drying of clothes under direct sunlight
Cooling effect caused by sweating in humans
The colour of a liquid relates to its absorption spectrum of light, which does not govern the kinetic energy distribution of molecules required for phase transition.
Options A, B, and C are all factors that directly influence the physical process of evaporation.
D is correct тАФ the colour of the liquid does not influence the kinetic energy of its molecules, and therefore it has no effect on the rate of evaporation.
Always remember that evaporation is a surface-level process, unlike boiling which is a bulk phenomenon; questions often test this distinction.
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