Determining Absolute Zero

I just performed a lab in my physics class, and there are a few conceptual questions that I am having trouble with. The lab was simple. We took a constant volume sphere made of Stainless steel and filled with air. We changed the temperature of the water it was in to record the corresponding change in pressure.

1.The sphere used was filled with air, which is not an ideal gas. Does this play a role in increasing percent error? Why or why not?
I think it would have an effect since air is not uniform throughout, but im not sure and not sure of why.

2. The sphere is made of stainless Steel. Is this a good choice? If so why? If not, why not and what would be a good alternative? Explain why it would be better.

I’m pretty sure that this has to do with specific heats. Stainless steel’s is 490 J/kg. Im not sure if you would prefer a metal with a higher (such as Aluminum) or lower(Lead) specific heat in this experiment.

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