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# Why does a puddle dry up after the rain stops? What happens to the water? When water or other liquids are heated enough, they turn into a gas. Water turns into a gas called water vapor. When liquids change into gases, they evaporate. Evaporation happens because some of the molecules in the li...

# Why does a puddle dry up after the rain stops? What happens to the water? When water or other liquids are heated enough, they turn into a gas. Water turns into a gas called water vapor. When liquids change into gases, they evaporate. Evaporation happens because some of the molecules in the liquid gain heat energy. When these molecules get hotter, they move faster and farther apart. This continues until they break free from the surface of the liquid and move into the surrounding air.