Edexcel IGCSE Physics topic guide
Edexcel IGCSE Physics Solids, liquids and gases questions
Solids, liquids and gases links particle behaviour to density, pressure, changes of state, thermal energy and gas laws.
Solids, liquids and gases topic overview
Solids, liquids and gases links particle behaviour to density, pressure, changes of state, thermal energy and gas laws.
Move between the particle model and measurable quantities carefully, convert temperatures to kelvin for gas laws, and keep volume and pressure units consistent.
Question types in solids, liquids and gases
- Density, pressure, specific heat capacity and gas-law calculations.
- Particle-model explanations for states, pressure, temperature and changes of state.
- Heating and cooling graph interpretation, including constant-temperature regions.
- Practical methods for density and specific heat capacity measurements.
Solids, liquids and gases subtopics
Choose a subtopic for its syllabus points, answering guidance and worked exam questions.
5.a Units
5.1 use the following units: degree Celsius (°C), Kelvin (K), joule (J), kilogram (kg), kilogram/metre³ (kg/m³), metre (m), metre² (m²), metre³ (m³), metre/second (m/s), metre/second² (m/s²), newton (N) and pascal (Pa)
5.b Density and pressure
5.3 know and use the relationship between density, mass and volume: density = mass / volume ρ = m / V
5.c Change of state
5.8P explain why heating a system will change the energy stored within the system and raise its temperature or produce changes of state
5.d Ideal gas molecules
5.15 explain how molecules in a gas have random motion and that they exert a force, and hence a pressure, on the walls of a container