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Properties of Air

Properties of Air. Air has _________. Why? Air is made up of ___________ + ___________. Mass. Atoms. Molecules. Density. Mass ÷ Volume = __________ Density ____________ as the # of molecules in given volume increases. Density ____________ as the # of molecules in given volume decreases.

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Properties of Air

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  1. Properties of Air

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

  3. 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

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

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

  6. 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!

  7. 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

  8. Temperature at Altitude • 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. Sea Level 10,000 Feet High (on top of mountain) colder sinks rises

  9. 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.

  10. Overview: Properties of Air • Properties of Air • Mass • Density • Air Pressure

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