Properties of Air Grade 6 Science Unit on
- Slides: 13
Properties of Air Grade 6 Science Unit on Flight
What do you think air is made from?
Overview: Properties of Air § Properties of Air - Air takes up space - Air has weight - Air has pressure - Air expands when heated - Air can be compressed to lift objects - Gravity acts on all forces equally
Mass § Air has _____. § Why? Atoms § Air is made up of ______ Molecules + ______.
Density § Mass ÷ Volume = _____ increases as the # of – Density ______ molecules in given volume increases. decreases as the # of – Density ______ molecules in given volume decreases. ** Volume = amount of space matter takes up! ** Remember: atoms/molecules make up matter.
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?
Warm Air vs. Cold Air 1 2 Warm air because it has _______ less # 1 = _____ molecules. Cold air because it has _______ # 2 = _____ more molecules.
Why do you think hot air balloons rise? Would it rise with cold air?
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!
Air Pressure § What is pressure? – Force pushing on an area. – Denser air exerts _____ more pressure because _____________ there are molecules in a given volume. – As altitude increases, air pressure decreases _________.
§ Do you to think the temperature is cooler at the top of a mountain or bottom?
Temperature at Altitude Sea Level 10, 000 Feet High (on top of mountain) colder at the top of a mountain because § It is _____ the molecules are not bumping into each other as much. sinks and warm air ____. rises § Cold air ____ § When warm air rises, the molecules spread out & then the air becomes colder. This cooled air sinks.
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.