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Water evaporating from your skin draws heat from your body, leaving you feeling cold even on a hot day. The cooling effect of evaporation is also nature’s way of cooling the Earth! With the How Cool is That? Evaporation of Liquids—ChemTopic™ Lab Activity, measure the temperature changes that occur when different liquids evaporate. Compare their rates of evaporation using a computer interface with temperature probes or sensors soaked in various liquids to record temperature versus time as the liquids evaporate, then compare pairs if liquids and analyzed them in terms of the strength of attractive forces.