1. Properties of Air Grade 6 Science Unit on Flight

2. What do you think air is made from?

3. Overview: 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

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

5. 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

6. 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?

7. Warm Air vs. Cold Air Warm air less Cold air more1 2
Warm air
less
# 1 = __________ because it has _______ molecules.
# 2 = __________ because it has _______ molecules.
Cold air
more

8. Why do you think hot air balloons rise? Would it rise with cold air?

9. 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!

10. 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

11. Do you to think the temperature is cooler at the top of a mountain or bottom?

12. 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

13. 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.