Can you breathe it? If so, it might be a gas. Gases have no color, shape, or size. Almost everything is one of three kinds of matter--a liquid, a solid, or a gas. Discover more about gases and matter in Gases.
General Note
"AV2 world languages: English, Espanol, Francais, pu tong hua, Russkii?, Arabic"--Cover.
Content Note
What is a gas? --Size of gases --Seeing gases --Feeling gases --What is matter? --Cooling gases --Boiling liquids --Gases and the Sun --What is water? --What did you learn?.