Boyle’s Law Flashcards
Gas pressure cause
Gas pressure is due to the rate of the collisions of the gas molecules with the sides of the container, which exert a force on it.
What happens to the pressure when we reduce the volume of a gas?
A smaller volume means more collisions every second and so more force exerted on the container. The surface area will also decrease. Hence, the pressure increases if we decrease the volume.
Draw a gas in a container being put more pressure on
N/a
As volume increases…
Pressure decreases. They are inversely proportional.
Draw the sign for inverse proportion
N/a
Draw the sign for direct proportion
N/a
Draw a graph of two inversely proportional factors
N/a
Draw a graph of two directly proportional factors
N/a
Draw the graph of Pressure (kPa) vs Volume (m^3)
N/a
As 1/volume increases
Pressure increases. They are directly proportional
Draw the graph of pressure (kPa) vs 1/Volume (m^-3)
N/a
Boyle’s Law
Boyle’s law states that for a fixed mass of gas at a constant temperature, its pressure is inversely proportional to its volume.
Or
pV = constant
Equation of Boyle’s Law
P(1)V(1) = P(2)V(2)
Decreasing the volume of a gas at fixed temperature increases the pressure, and vice versa.
Bag of crisps analogy
Mid-flight: Due to high altitude, lower pressure, hence the constant internal pressure is able to overcome external pressure, meaning a bigger volume
Landing: higher pressure at low altitude, hence the bag of crisps shrink as the external force increases, meaning a smaller volume
