#P1.3a
explain how the motion of the molecules in a gas is related both to its temperature and its pressure
application to closed systems only
#P1.3b
explain the relationship between the temperature of a gas and its pressure at constant volume (qualitative only)
#P1.3c
recall that gases can be compressed or expanded by pressure changes and that the pressure produces a net force at right angles to any surface
#P1.3d
explain how increasing the volume in which a gas is contained, at constant temperature can lead to a decrease in pressure
behaviour regarding particle velocity and collisions
#P1.3e
explain how doing work on a gas can increase its temperature
examples such as a bicycle pump
#P1.3f
describe a simple model of the Earth’s atmosphere and of atmospheric pressure
an assumption of uniform density; knowledge of layers is not expected
#P1.3g
explain why atmospheric pressure varies with height above the surface of the planet
#P1.3h
describe the factors which influence floating and sinking
#P1.3i
explain why pressure in a liquid varies with depth and density and how this leads to an upwards force on a partially submerged object
#P1.3j
calculate the differences in pressure at different depths in a liquid
knowledge that g is the strength of the gravitational field and has a value of 10 N/kg near the Earth’s surface