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Air Volume

Dewdrop's balloon is growing as the temperature is rising!

No air molecules are added to the balloon as it grows larger. Take a look at the thermometer at the left. The temperature is rising as the balloon grows in size. The balloon grows larger because, with a fixed amount of gas, when the temperature is increased, the volume increases. The same molecules take up more space! The opposite is true as well. When the temperature is decreased, the volume decreases. This direct relationship between temperature and volume is expressed by Charles's Law.