P1.3 Flashcards
What is the formula for pressure?
Force (Newton)
———————-
Surface Area (M^2)
What are the units for pressure?
Pascals or N/m^2
What is the relationship between the temperature of a gas and its pressure?
They are are directly proportional PROVIDED THAT THE VOLUME IS CONSTANT
What happens if you add more air particles to a space that can’t expand?
The pressure would increase
What can you use to measure pressure?
A pressure gauge
What is a kilopascal (kPa)?
1000 pascals (Pa)
What would happen to pressure if the temperature got to -273 degrees Celsius or 0 degrees kelvin (absolute zero)?
The pressure would be at 0 pascals
What happens to the particles when the temperature increases?
They collide more frequently with the sides of the container and these collisions produce a bigger force over a certain area.
How are pressure and volume related?
They are inversely proportional when the temperature is constant
Pressure x volume = constant
How does doing work on a gas affect temperature?
If you do work on a gas it gets hotter - average speed of particles increase, kinetic energy increase when the collide
What is atmospheric pressure?
The pressure exerted on everything by the gases of the atmosphere
What is the number for atmospheric pressure on earth?
100,000 Pa or 100kPa
How can you prove atmospheric pressure?
When you remove air from a can, atmospheric pressure crushes the can
What would happen to a bag of crisps as it goes up the earth atmosphere and why?
The bag would expand due to the atmospheric pressure decreasing but the pressure in the bag stays the same
How do you calculate liquid pressure (Pa)?
Depth (m) x density of liquid (Kg/m^3) x gravitational field strength (N/Kg) which is 10
