The density of mercury changes approximately linearly with temperature as Hg = 13595 2.5 T kg/

Question:

The density of mercury changes approximately linearly with temperature as
ρHg = 13595 − 2.5 T kg/ m3 T in Celsius
so the same pressure difference will result in a manometer reading that is influenced by temperature. If a pressure difference of 100 kPa is measured in the summer at 35°C and in the winter at −15°C, what is the difference in column height between the two measurements?