(b) Density and pressure

Know and use density = mass ÷ volume, ρ = m/V.

Practical: investigate density using direct measurements of mass and volume

Know and use pressure = force ÷ area, p = F/A.

Understand how the pressure at a point in a gas or liquid at rest acts equally in all directions

Know and use pressure difference = height × density × gravitational field strength, p = hρg.