know and use the relationship between density, mass and volume:

\(\text{density} = \dfrac{\text{mass}}{\text{volume}} \)

\(ρ = \dfrac{m}{V}\)

practical: investigate density using direct measurements of mass and volume

know and use the relationship between pressure, force and area:

\(\text{pressure} = \dfrac{\text{force}}{\text{area}} \)

\(p = \dfrac{F}{A}\)

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

know and use the relationship for pressure difference:

pressure difference = height × density × gravitational field strength

\(p = h × ρ × g\)