The rate of evaporation is affected by several factors: (1) The strength of intermolecular forces - Weaker forces result in a higher evaporation rate. (2) Temperature - Higher temperatures increase the kinetic energy of molecules, increasing evaporation rate. (3) Surface area - A larger surface area exposes more molecules that can escape, accelerating evaporation.

1. Factors affecting the rate of evaporation
(1) Nature of Liquids : The magnitude of inter-molecular forces of attraction in
liquid determine the speed of evaporation. Weaker the inter-molecular forces of
attraction larger is the extent of evaporation. In diethyl ether rate of evaporation is
greater than that of ethyl alcohol.
(2) Temperature : The rate of evaporation of liquids varies directly with temperature.
With the increase in the temperature, fraction of molecules having sufficient kinetic
energy to escape out from the surface also increases. Thus with the increase in
temperature rate of evaporation also increases.
(3) Surface Area : Molecules that escape the surface of the liquids constitute the
evaporation. Therefore larger surface area contributes accelerating evaporation.
(4) Composition of Environment : The rate of evaporation of liquids depends upon
the flow of air currents above the surface of the liquid. Air current flowing over the
surface of the liquid took away the molecules of the substance in vapour state there by
preventing condensation.
(5)Concentration of the substance evaporating in the air : If the air already has
a high concentration of the substance evaporating, then the given substance will
evaporate more slowly.
(6)Concentration of other substance in the air : If the air is already saturated
with other substances, it can have a lower capacity forth substance evaporating.
(7)temperature of the substance . if the substance is hotter, then evaporation will be
faster.
(8)Flow rate of air : this is in part related to the concentration point above. If fresh
air Is moving over the substance all the time, then the concentration of the
substance in the air is less likely to go up with time, thus encouraging faster
evaporation . In addition , molecules in motion have more energy than those at rest,
and so the stronger the flow of air, the greater the evaporating power of the air
molecules.
(9)Inter-molecular force: the stronger the forces keeping the molecules together
in the liquid or solid state the more energy that must be input on order to evaporate
them.

2. (10)Density: The higher the density , the slower a liquid evaporates. In the US, the
national weather service measures the actual rate of evaporation from a
standardized “pan” open water surface outdoor, at various locations nationwide.
Others do likewise around the world. The US data is collected and compiled into
an annual evaporation map. The measurements range from under 30 to over the
120 inches (3,000mm) per year.
(11)pressure: In an area of less pressure, evaporation happens faster because there
is less exertion on the surface keeping the molecules from launching themselve