Ideal Gas. Air is contained in a volume with a piston. The piston is pushed down to half of the original height while the temperature is held constant.

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Presentation transcript:

Ideal Gas

Air is contained in a volume with a piston. The piston is pushed down to half of the original height while the temperature is held constant by a surrounding ice bath. By which factor does the force of the air against the piston change? a) 1/2 b) 1 c) 2 d) 4

150 K Air at 150 K is contained in a can with a lose piston. The temperature is increased to 300 K. Where will the piston be? a) At ½ height b) At twice the height c) No change d) No change, but the pressure will be half

An Air compressor increases the pressure from 1 atm to 5 atm. Enough time is given for the temperature to adjust back to the surrounding temperature. If the density of the outside air is 1.2 kg/m 3, what is the density of air inside of the air compressor? 6 kg/m 3

The tank holds a volume of 50 L. By how much does the weight of the tank change, if the density is increased from 1.2 kg/m 3 to 6 kg/m 3 ?

Compare the density of dry air at a summer temperature of 30 C to the density of dry air at -20 C by finding the ratio of density summer/winter.

If the atmospheric pressure on a 15 C is equal to 1002 hPa, how much mass of air is contained in a room the size of the class room (20m by 20 m by 3 m)?

How much pressure will the weight of this air exert onto the floor of the room (20m by 20 m by 3 m)?

How much mass of air is located in an air column of 1 square meter cross sectional area, in order to cause normal atmospheric pressure with its weight?

Constant density: kg/m 3 Constant pressure 1000 mbar Needs a force equivalent to the weight of the air 1000 m

1000 mbar 1000 m 100 mbar Releasing a slice of 1/10 of mass on top Density and pressure drop – why?

1000 mbar 1000 m 100 mbar Releasing another slice of 1/10 of mass 100 mbar 200 mbar

1000 mbar 1000 m Releasing a third slice of 1/10 of mass 100 mbar 200 mbar 100 mbar 200 mbar 300 mbar

1000 mbar 1000 m Releasing a 4th slice of 1/10 of mass 100 mbar 200 mbar 300 mbar 100 mbar 400 mbar

Continuous atmosphere 2000 m800 mb80% above 0 m1000 mb100% above 5500 m500 mb50% below m200 mb80% below

The density of air dry moist Nitrogen replaced by water molecules: M(nitrogen)=28 to M(water)=18 Which of these air parcels will have the lower density?