Physics resources for IGCSE or GCSE students.  Developed by Conor Sheedy

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Revision sheets for IGCSE or GCSE physics.
This series revision sheets are based on the IGCSE & GCSE syllabuses.
Lots of formulas, definitions and key points to learn off.
There are also accompanying test sheets to check your memorisation. 

The idea is read the information and than print the quiz sheet and try the questions.

Revision Exercise six: Solids, liquids and gases Units unit of temperature : degrees Celsius (oC), kelvin (K), unit of density kilogram/metre 3 (kg/m3) unit of pressure, pascal (Pa) Density and pressure density = mass / volume ρ = m / V pressure = force / area p = F / A the pressure at a point in a gas or liquid which is at rest acts equally in all directions In a liquid:  pressure difference = height × density × g p = h× ρ × g

Ideal gas molecules

Brownian motion, is random motion caused by the random motion of air molicules.

molecules in a gas have a random motion and that they exert a force and hence a pressure on the walls of the container

there is an absolute zero of temperature which is – 273 oC

the kelvin temperature = the Celsius temperature + 273

an increase in temperature results in an increase in the speed of gas molecules

the kelvin temperature of the gas is proportional to the average kinetic energy of its molecules

for a gas in a sealed container when the kelvin temperature increases the pressure increases.

the relationship between the pressure and kelvin temperature of a fixed mass of gas at constant volume:

p1/ T1 = p2/ T2

the relationship between pressure and volume of a fixed mass of gas at constant temperature

p1V1 = p2V2

Quiz for revision exercise six: 3 stages of matter quiz