PhysicsCode 5054
Pressure
What this topic asks you to be able to do
- Define pressure as the force acting per unit area; remember and apply the relationship pressure = force / area p = F / A
- Describe the manner in which pressure depends on force and area, drawing on everyday examples
- State that the force from pressure at a surface always acts at right angles to that surface, and describe an experiment that shows this
- Describe how a liquid barometer can be used to find atmospheric pressure from the height reached by its liquid column
- Describe in quantitative terms how the pressure below the surface of a liquid varies according to its depth and the liquid's density
- Recall the equation for how pressure changes below the surface of a liquid, pressure change = density × gravitational field strength × height change, or ∆p = ρg∆h, and use it