Christian.
You explained the answer better than I phrased the question! I do see the differences between heat and temperature: I was just careless with the terms.
I think we ended up in the same place:- use a higher mass gas (and high specific heat capacity.... are they almost the same?): Xenon looks a good (but expensive) option......) Nitrogen is pretty inert and cheap. With a fluctuating energy input, it should remain in a narrower temperature range than a 'lighter' gas.
Obviously, all these things are a generalisation!
I would still argue that if one volume of gas arrives at a 80 degrees and another only gets to 70 degrees when the same amount of energy is 'inserted', then the first gas probably GETS to 70 degrees 'quicker' too!
Thanks, Christian.
Ian
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