Everything is made of matter, and matter comes in three main states: gases, liquids, and solids. Unlike liquids and solids, gases do not have a fixed shape and can spread out to fill any space. Gases are all around us, even though we cannot see most of them. They put the fizz in soda drinks, make balloons float in the air, and give food its smell. Air is a mixture of gases that surrounds Earth. It contains the oxygen that supports life and determines the weather. Find out about gases and how they behave.
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