We can't see or ____ air, but sometimes we can ____ it. Air is matter because it has ____, mass, temperature and it can be ____. Air contains tiny ____ and solid particles, too. The particles of gases move in ____. When gases are heated, these particles start moving ____. The air we breathe is a mixture of different gases: nitrogen, ____, carbon-dioxide and some other gases. Air is ____. If air is hotter it takes up more room, becomes ____, and ____. If air is cold, it sinks because it is ____. We can measure the weight of air, ____, with a barometer.

Unit 3.4 - Properties of Gases and Air (missing words)

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