Thermal Physics

Worked examples (12)extended set

• 1Identify and describe the states from particle diagrams
• 2Properties of the three states (multiple choice)
• 3A gas cylinder warming in the sun
• 4Heating gas in a rigid container (multiple choice)
• 5Explaining gas pressure using forces on the wall
• 6Brownian motion of smoke particles
• 7Compressing air and water in syringes
• 8Spot the incorrect reading in a Boyle's law table (multiple choice)
• 9Air from a scuba tank at atmospheric pressure
• 10Which graph shows Boyle's law? (multiple choice)
• 11Boyle's law experiment with trapped air
• 12Air trapped in a diving bell

Model answers (6)

• ✓Model answer — Paper 2/4 short-answer style
• ✓Model answer — Paper 2/4 style
• ✓Model answer — Paper 4 explanation style
• ✓Model answer — Paper 4 explanation style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 multi-part structured style

Worked examples (12)extended set

• 1Reading a heating curve: melting and boiling
• 2Everyday consequences of thermal expansion
• 3Why a gas expands more than a solid (multiple choice)
• 4Defining specific heat capacity and calculating it with unit conversions
• 5What a larger specific heat capacity means (multiple choice)
• 6Reading energy from a graph and scaling it by mass
• 7Electrical method for the specific heat capacity of a solid
• 8Measuring the specific heat capacity of water with a joulemeter
• 9Internal energy and the average kinetic energy of particles
• 10Evaporation and cooling: dry and wet thermometers
• 11Method of mixtures: specific heat capacity of a metal
• 12Comparing specific heat capacities from heating graphs

Model answers (6)

• ✓Model answer — Paper 2/4 short-answer style
• ✓Model answer — Paper 2/4 style
• ✓Model answer — Paper 4 explanation style
• ✓Model answer — Paper 4 structured style
• ✓Model answer — Paper 4 extended-explanation style
• ✓Model answer — Paper 6 / Alternative-to-Practical extended style

Worked examples (12)extended set

• 1Convection currents from a cooling unit high on a wall
• 2Comparing thermal conductors from experimental results
• 3Conduction in a metal and a plastic: particle explanation
• 4Which surface emits infrared at the smallest rate? (multiple choice)
• 5Cooling of a matt black and a shiny can: rates and conclusion
• 6An infrared food-warming lamp with a polished hood
• 7Constant temperature in sunlight (multiple choice)
• 8A car radiator: more than one method of transfer
• 9White walls and black solar panels
• 10Double glazing: reducing all three transfers
• 11Planning an investigation into insulation and cooling
• 12Reading a cooling curve: how the rate changes with temperature

Model answers (6)

• ✓Model answer — Paper 2/4 short-answer style
• ✓Model answer — Paper 2/4 style
• ✓Model answer — Paper 4 explanation style
• ✓Model answer — Paper 4 application style
• ✓Model answer — Paper 4 extended-explanation style
• ✓Model answer — Paper 4 multi-part application style