The Joule-Kelvin coefficient is given by *=().-EE).-リ (1) Since it involves the absolute temperature T, this relation can be used to deter- mine the absolute temperature T. Consider any readily measurable arbitrary temperature parameter ở (e.g., the height of a mercury column). All that is known is that ở is some (unknown) function of T; i.e., v = 8(T). (a) Express (1) in terms of the various directly measurable quantities involving the temperature parameter ở instead of the absolute temperature T, i.e., in terms of u'= (a8/ap)n, C,' = (đQ/d0)p, a' = V-(av/08), and the derivative do/&T. (6) Show that, by integrating the resulting expression, one can find T for any given value of if one knows that ở = d, when T = T. (e.g., if one knows the value of v = 8o at the triple point where To = 273.16).

The Joule-Kelvin coefficient is given by *=().-EE).-リ (1) Since it involves the absolute temperature T, this relation can be used to deter- mine the absolute temperature T. Consider any readily measurable arbitrary temperature parameter ở (e.g., the height of a mercury column). All that is known is that ở is some (unknown) function of T; i.e., v = 8(T). (a) Express (1) in terms of the various directly measurable quantities involving the temperature parameter ở instead of the absolute temperature T, i.e., in terms of u'= (a8/ap)n, C,' = (đQ/d0)p, a' = V-(av/08), and the derivative do/&T. (6) Show that, by integrating the resulting expression, one can find T for any given value of if one knows that ở = d, when T = T. (e.g., if one knows the value of v = 8o at the triple point where To = 273.16).