In this research, the Joule-Thomson (JT) coefficient, mJT for CO2(g) and N2(g) distributed by Air Liquide was measured at high pressures (psig): 90,75, 65, 50 and 40 using the Joule-Thomson cell. The gauge pressures above were converted to atmosphere (atm) after taking readings of the voltage (mV) and converting to temperature (K). Plots of temperature (T) against pressure (Pp) obtained over time for the two gases were made with slopes ( mJT) evaluated to be -107.14 and -125Katm-1 for CO2 and N2 respectively. However, from literature, the JT coefficient for CO2 and N2 were 10.9 and 2.15k.MPa-1 respectively. This disparity is expected since mJT is a function of Pp and DPp, for a small pressure decrease originating at 1atm pressure. There is also a concordance in JT coefficient variation for the two gases as CO2 (-107.14Katm-1) has a higher value than N2 (-125katm-1) as contained in literature: CO2 (10.9kMPa-1) and N2(2.15kPa-1).The research confirms the behaviour of a real gas at high pressure with respect to the values of Joule- Thomson coefficient obtained.
