A simple U-tube manometer containing water is used to measure the pressure of a gas supply relative to atmospheric pressure. Which property of the water columns in the manometer is measured to determine this pressure difference?
The total volume of water in the manometer
The difference in height between the water levels in the two arms
The cross-sectional area of the manometer tubes
The temperature of the water
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.