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A method of simultaneously measuring thermal conductivity and heat capacity of a fluid, using a heat conduction calorimeter having a reference fluid in a first cell and a sample fluid in a second cell includes the steps of calibrating the calorimeter using a standard fluid having known thermal condu

A method of simultaneously measuring thermal conductivity and heat capacity of a fluid, using a heat conduction calorimeter having a reference fluid in a first cell and a sample fluid in a second cell includes the steps of calibrating the calorimeter using a standard fluid having known thermal conductivity and heat capacity over a range of temperatures and the reference fluid to determine a set of sensitivity parameters, {a.sub.n.sup.ij }, of the calorimeter, wherein the a.sub.n.sup.ij are functions of the calorimeter, temperature and the reference fluid; applying a square wave heat pulse to the calorimeter containing said sample fluid and said reference fluid; measuring the thermal response curve to the square wave heat pulse, wherein the thermal response curve is a function of time, temperature of the measurement, thermal properties of the sample fluid, and thermal properties of the reference fluid; reducing the response curve to a set of discrete characteristic parameters, {p.sub.n } wherein each pn is a function of time, temperature of the measurement, thermal properties of the sample fluid and thermal properties of the reference fluid; calculating the thermal conductivity and heat capacity of the sample fluid from the {p.sub.n } for the sample fluid and the {a.sub.n.sup.ij } for the calorimeter.

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[ What is claimed is:] [1.] A method of simultaneously measuring thermal conductivity, .lambda., and heat capacity, C, of a fluid, comprising the steps of:providing a heat conduction calorimeter having a first cell for receiving a reference fluid and a second cell for receiving a sample fluid;calibr

[ What is claimed is:] [1.] A method of simultaneously measuring thermal conductivity, .lambda., and heat capacity, C, of a fluid, comprising the steps of:providing a heat conduction calorimeter having a first cell for receiving a reference fluid and a second cell for receiving a sample fluid;calibrating the calorimeter using the reference fluid and at least one standard fluid having known thermal conductivity and heat capacity over a range of temperature to determine a set of sensitivity coefficients, {a.sub.n.sup.ij }, of the calorimeter, wherein the a.sub.n.sup.ij are functions of the calorimeter, temperature and the reference fluid;applying a square wave heat pulse to said calorimeter containing a sample fluid and said reference fluid;measuring a thermal response curve to the square wave heat pulse, wherein the thermal response curve is a function of time, temperature of the measurement, thermal properties of the sample fluid and thermal properties of the reference fluid;reducing the response curve to a set of characteristic parameters, {p.sub.n } wherein each p.sub.n is a function of time, temperature of the measurement, thermal properties of the sample fluid and thermal properties of the reference fluid; andcalculating the thermal conductivity and heat capacity of the sample fluid from the {p.sub.n } for the sample fluid and the {a.sub.n.sup.ij } for the calorimeter.