Hello, new to these forums(adsbygoogle = window.adsbygoogle || []).push({});

I'm trying to complete a basic thermodynamics problem, calculating the thermodynamic temperature of a gas immersed in water at triple point.

The problem begins with a table of pressures at varying temperatures of a gas under pressure P, and pressure P(tp) - triple point pressure.

Now, I know the following equation;

T=LIM_{PTP→0}P/P_{TP}* 273.16

So I have calculated the average value of P/P_{TP}as 1.53555

But I also have access to a solution to this problem, and in the solution an extra step is also taken:

I don't understand the source of the 2.5 * avg change between P and P(tp). Where has this come from? Why is it necessary?

Thanks

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# Thermodynamic Temperature

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