Properties of Air.

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Presentation transcript:

Properties of Air

Air is made up of ___________ + ___________. Mass Air has _________. Why? Air is made up of ___________ + ___________. Atoms Molecules

Mass ÷ Volume = __________ Density Mass ÷ Volume = __________ Density ____________ as the # of molecules in given volume increases. Density ____________ as the # of molecules in given volume decreases. ** Volume = amount of space matter takes up! ** Remember: atoms/molecules make up matter. increases decreases

Warm Air vs. Cold Air Which of the two above represents cold air? Why? 1 2 Which of the two above represents cold air? Why? Which of the two above represents warm air? Why?

Warm Air vs. Cold Air Warm air less Cold air more 1 2 Warm air less # 1 = __________ because it has _______ molecules. # 2 = __________ because it has _______ molecules. Cold air more

Warm Air vs. Cold Air Why do hot air balloons rise? Air is heated. Molecules bounce off each other. As a result, there are less molecules in a given volume. The warm air in the balloon is less dense than the cold air around the balloon so the balloon rises!

there are more molecules Air Pressure What is pressure? Force pushing on an area. Denser air exerts __________ pressure because _________________________ in a given volume. As altitude increases, air pressure __________________. more there are more molecules decreases

Temperature at Altitude Sea Level 10,000 Feet High (on top of mountain) colder It is __________ at the top of a mountain because the molecules are not bumping into each other as much. Cold air ________ and warm air ________. When warm air rises, the molecules spread out & then the air becomes colder. This cooled air sinks. sinks rises

Air Pressure Continued The amount of air pressure being exerted on your desk and you is the weight of a school bus. Why are you not smashed like a pancake? Air pressure acts in ALL directions.

Overview: Properties of Air Mass Density Air Pressure