Usually all substance expands uniformly with temperature except few fluids such as water. In general, when liquid is heated it expands with temperature as the kinetic energy of the micro particles increases. Due to the anomalous behavior of water, it’s volume decreases with temperature from 0°C to 4°C and after 4°C like other fluids it expands with temperature. In a scenario where the temperature scale is yet to be defined, the uniform expansion behavior of mercury can be analyzed by performing a relative study of expansion of mercury with expansion of other fluids. Temperature scale just represents the relative level of magnitude of temperature. Hence, we cannot justify the statement that mercury expands uniformly before temperature scale was defined.