properties of air
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Properties of AirProperties of Air
Air has _________.Air has _________. Why?Why? Air is made up of ___________ Air is made up of ___________
+ ___________.+ ___________.
Mass
AtomsMolecules
Mass Mass ÷ Volume = __________÷ Volume = __________– Density ____________ as the # of Density ____________ as the # of
molecules in given volume increases.molecules in given volume increases.– Density ____________ as the # of Density ____________ as the # of
molecules in given volume decreases.molecules in given volume decreases.
** Volume = amount of space matter takes ** Volume = amount of space matter takes up!up!
** Remember: atoms/molecules make up ** Remember: atoms/molecules make up matter.matter.
Density
decreases
increases
Warm Air vs. Cold AirWarm Air vs. Cold Air
Which of the two above represents cold air? Which of the two above represents cold air? Why?Why?
Which of the two above represents warm air? Which of the two above represents warm air? Why?Why?
1 2
Warm Air vs. Cold AirWarm Air vs. Cold Air
# 1 = __________ because it has _______ # 1 = __________ because it has _______ molecules.molecules.
# 2 = __________ because it has _______ # 2 = __________ because it has _______ molecules.molecules.
1 2
Warm air
Cold air
less
more
Warm Air vs. Cold AirWarm Air vs. Cold Air
Why do hot air balloons rise?Why do hot air balloons rise?
– Air is heated. Molecules bounce off each other. As a Air is heated. Molecules bounce off each other. As a result, there are less molecules in a given volume. The result, there are less molecules in a given volume. The warm air in the balloon is less dense than the cold air warm air in the balloon is less dense than the cold air around the balloon so the balloon rises!around the balloon so the balloon rises!
Air PressureAir Pressure
What is pressure?What is pressure?– Force pushing on an area.Force pushing on an area.
– Denser air exerts __________ pressure Denser air exerts __________ pressure because _________________________ because _________________________ in a given volume.in a given volume.
– As altitude increases, air pressure As altitude increases, air pressure __________________.__________________.
morethere are more molecules
decreases
Temperature at AltitudeTemperature at Altitude
It is __________ at the top of a mountain because It is __________ at the top of a mountain because the molecules are not bumping into each other as the molecules are not bumping into each other as much.much.
Cold air ________ and warm air ________.Cold air ________ and warm air ________. When warm air rises, the molecules spread out & When warm air rises, the molecules spread out &
then the air becomes colder. This cooled air then the air becomes colder. This cooled air sinks.sinks.
Sea Level 10,000 Feet High (on top of mountain)
colder
sinks rises
Air Pressure ContinuedAir Pressure Continued
The amount of air pressure being exerted The amount of air pressure being exerted on your desk and you is the weight of a on your desk and you is the weight of a school bus. Why are you not smashed like school bus. Why are you not smashed like a pancake?a pancake?
– Air pressure acts in ALL directions.Air pressure acts in ALL directions.
Overview: Properties of AirOverview: Properties of Air
Properties of AirProperties of Air– MassMass
– DensityDensity
– Air PressureAir Pressure