How does water turn into a gas?

first answers right (sort of). yes called evaporation. may helpful remember temperature measure of average thermal energy of molecules (or atoms). so... molecules have more average , less. have more, of them have enough energy escape surface of liquid , become vapor. and... unless live in dry desert, there h2o molecules bouncing around in air gas. when on of these happens smack liquid water, can stick (turn liquid). raise temperature (increasing average energy) more , more h2o escape. when reach 100c (if @ sea level) vapor pressure of water equals 1 atm (14.7 psi or 760 torr) , water boiling.

other things, metals, change liquid vapor same way.

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