Consider two thermometers T₁ and T₂ of equal length which can be used to measure temperature over the range ₁ to ₂ . T₁ contains mercury as thermometric liquid while T₂ contains bromine. The volumes of the two liquids are the same at the temperature ₁ . The volumetric coefficients of expansion of mercury and bromine are 18 10⁻⁵ ~K ⁻¹ and 108 10⁻⁵ ~K ⁻¹ , respectively. The increase in length of each liquid is the same