An industrial sensor measures the pressure of oil in a large storage tank at two different depths. The measurements are taken on a cold day when the oil is at 10 ∘C10\ ^\circ\text{C}10 ∘C and repeated on a hot day when the oil is at 40 ∘C40\ ^\circ\text{C}40 ∘C.
The density of the oil decreases when its temperature increases.
Which combination of depth and temperature produces the least oil pressure?
Depth of 8 m8\text{ m}8 m, temperature of 10 ∘C10\ ^\circ\text{C}10 ∘C
Depth of 8 m8\text{ m}8 m, temperature of 40 ∘C40\ ^\circ\text{C}40 ∘C
Depth of 18 m18\text{ m}18 m, temperature of 10 ∘C10\ ^\circ\text{C}10 ∘C
Depth of 18 m18\text{ m}18 m, temperature of 40 ∘C40\ ^\circ\text{C}40 ∘C
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.