Chapter 5
Pressure
Pressure relates a force to the area over which it acts.
Learn to identify the relevant area, vertical depth and pressure reference before calculating.
Includes surface pressure, density, liquid pressure, hydraulic presses, barometers and manometers. For K323 (2027) / 6091 (2026).
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Pressure at a surface
Relate pressure to perpendicular force and contact area, and convert areas correctly.
Density from measurements
Measure mass and volume, calculate density and use consistent units.
Pressure in a liquid
Relate pressure to vertical depth and distinguish the liquid contribution from total pressure.
Hydraulic systems
Explain transmitted pressure and calculate forces on pistons with different areas.
Measuring atmospheric pressure
Explain how a barometer's liquid column measures atmospheric pressure.
Manometers and pressure differences
Read a liquid-level difference and use the reference pressure to calculate a gas pressure.