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pressure
the force caused by collisions between particles on a gas and a surface
pressure equation
force/area
atmosphere
the shell of air surrounding earth, extering a pressure on us at all times
What is the atmosphere composed of?
78% nitrogen, 21% oxygen, 1% other gases
atmosphereic pressure
the sum of the individual pressures of all gas particles in the atmosphere above us
atmosphereic pressure decreases with...
altitude
A barometer measures...
atmospheric pressure
Toricelli
invented the barometer (italian)
manometer measures...
gas pressure
open manometer
when the liquid is close to the atmosphere, you substract
closed manometer
when the liquid is close to the bulb, you add
mmHg
millimeters of mercury
Pa
pascal (pressure)
Torr
torr
atm
atmosphere
psi
pounds per square inch (tire gauges)
1 atm = ? kPa
101.325 kPa
1 atm = ? mmHg
760 mmHg
1 atm = ? torr
760 torr
Boyle's Law
P1V1=P2V2, constant tempurature
Charles' Law
V1/T1=V2/T2, constant pressure
Gay-Lussac's Law
P1/T1=P2/T2 (directly proportional), constant volume
Combined Gas Law
P1V1/T1=P2V2/T2
ideal gas law
- no volume
- no molecular attraction
- follows gas laws at all pressures and temperature
real gas
- has volume
- has molecules
- differs at low temp and high pressure
ideal
used to find an unknown property of a gas
combined
used to find an unknown property (in place of an IFE table)