Evaporation occur at any temperature.
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Boiling water transforms into water vapor at a temperature of 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure.
Water starts to evaporate as soon as it reaches its boiling point of 100 degrees Celsius (212 degrees Fahrenheit). At this temperature, the kinetic energy of the water molecules increases enough for them to overcome the intermolecular forces holding them together, transitioning from liquid to gas state.
There are more water vapor molecules above a beaker of water at its boiling point because the higher temperature causes more water molecules to evaporate into the air. This results in a higher concentration of water vapor over the boiling water compared to room temperature water.
You boil a substance to evaporate the liquid.
water boils at 100o C.but room temperature may not rise to that much. only after boiling it may be converted to the gaseous state.