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Suggest an experiment to prove that the rate of evaporation of a liquid depends on its surface area and vapour already present in surrounding air .



Rate of Evaporation is affected proportionally by:
1- Temperature (indicator to kinetic energy)
2- Pressure 
3- Surface Area

and affected inversely by:  
1- Intermolecular Forces (which affected by matter concentration " dissolvedsubstances as salts and dissolved gases as N2,O2,CO2 
2- Humidity
3- WindThe rate of evaporation will be increased by bigger surface area. The greater the exposed surface, the faster the evaporation. This is becausewater molecules need to be at the surface of the water to evaporate. With a big surface area more water molecules can be at the surface of the waterand therefore more water can evaporate.  In general the overall rate of evaporation will depend on the surface area exposed to the drying effects of the environmental conditions: Temperature, humidity, presence or absence of adjacent air and movement.

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An experiment to prove that the rate of evapouration of a liquid depends on its surface area and vapour already presents in surrounding air
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