Why are readings taken with descending temperature?

Question

I carried out an experiment to investigate the thermodynamics of the ammonium carbamate dissociation.

NH2COONH4 (s) <--> 2NH3 (g) + CO2 (g)

Measurement of the dissociation pressure at a particular temperature enables the equilibrium constant and delta G standard at that temperature to be calculated. From measurements of the dissociation pressure over a range of temperature, the mean delta H standard and delta S standard may be calculated.

Why were the readings taken with descending temperature?

Equipment used was ballast chamber, vacuum line, pump, pressure gauge, cold trap, isoteniscope, stirrer etc...

Thank you in advance.

Answer 1

You have described the calculation very clearly.

I think that the readings were taken with descending temperature just as a matter of convenience with your particular experimental setup. Nothing fundamental about it.