P1.3.2 - Pressure and volume

Cards (7)

How are pressure and volume related
In a syringe if you seal the of it and press the plunger the volume of the gas decreases and the pressure has doubled.
Key things to remember

Volume and pressure are inversely proportional to each other, In other words:
As the volume doubles the pressure halves
As the volume halves the pressure doubles
Why is pressure and volume inversely proportional?
The collisions of the gas particles produce a force that is at right angles to the surface. If you half the volume , you double the number of gas particles colliding per second against the container
How do you calculate with pressure and volume?
Using the formula
Pressure(Pascals) x Volume(m³) = constant
You have a large syringe of air. When the pressure is 2x10^5Pa the volume of the gas is 4x10^-6(0.000004)m³. Calculate the volume when the pressure is 5 x10^5Pa
The formula you must use is : Pressure x volume = constant (rearranged)
Answer = 1.6x10^-6m³ (2 sig fig)
This can measure pressure and volume
apparatus
How does doing work on a gas affect the temperature?
When using a bike pump you may notice that the vale gets hot. You can increase the internal energy of a gas by:
heating it
doing work on it

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