A mercury thermometer measures temperature by measuring the volume expansion of a fixed mass of liquid Hg due to a change in the density, Find the relative change (%) in volume for a change in temperature from 10°C to 20°C.
From 10°C to 20°C
At 10°C : ρHg = 13595 – 2.5 × 10 = 13570 kg/m3
At 20°C : ρHg = 13595 – 2.5 × 20 = 13545 kg/m3
The volume from the mass and density is: V = m/ρ
