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Weather Unit 2
Terms in this set (26)
What causes air pressure?
The air in atmosphere colliding with surfaces and in turn exerting force
How is pressure calculated?
psi (lbs per square in.) or force (N) over area (meters squared)
What happens to the pressure and density of a gas if it's heated?
pressure increases and density decreases
How does pressure, volume, and temperature of a gas in a balloon change as it increases in altitude? Defend your answer with the gas laws.
As altitude increase the pressure and temperature decreases, volume increases, combined gas law
Under which conditions do clouds form best?
cold temperature and low pressure
When do large, puffy clouds form? Explain why.
when cold fronts overtake warm fronts
When do wispy clouds form? Explain why.
when warm fronts overtake cold fronts
What is the relationship between weather fronts and air pressure?
where the fronts meet the is low pressure and where the are no fronts there is high pressure
What do the lines on the map below represent? Explain.
isobars in millibars
as a force over a specific surface area.
air pressure that is always present on Earth as a result of air molecules colliding with objects on the planet.
Describe how pressure varies as the volume of a trapped gas changes.
when volume increases pressure decreases
if temperature is held constant, pressure is inversely proportional to volume
if pressure is held constant, volume is directly proportional to temp
if volume is held constant, pressure is directly proportional to temperature
Combined Gas Law
Nothing is held constant, pressure and temperature are inversely proportional to volume
atm to pascal
atm to kilopascal
atm to mmHg
atm to torr
atm to psi
standard temp and pressure: 273 kelvin at 1 atm