... molecules to escape into the air. As molecules absorb heat from their surroundings to evaporate, they also decrease the temperature of the surrounding because they absorbed all the heat energy. This means that evaporation is an endothermic process. So, when the most energetic molecules jump off into the air, the cooler molecules are left behind with less energy. All together, the surroundings become cooler during evaporation. That is why the thermometer gets cooler in the lab. So, the final temperature of the substances was less than the initial temperature since the most energetic molecules are gone. Vapor pressure is determined by the intermolecular forces between the molecules. If the molecules have enough energy in them, they'll be able to break those forces that cause attractions between each other. However, as the strength of the intermolecular forces increase, it's harder for the molecules to lose those attractions since they require more energy ...

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