# Ideal gas and absolute zero

## Homework Statement

Calculate your experimental value of absolute zero , how does your experimental value compare to the theoretical value -273C?

## Homework Equations

T_abs=(S1*T2-S2*T1)/(S1-S2)

## The Attempt at a Solution

This is all part of a lab. I'm not asking people to do any calculations. I'm more worried about my calculations from what I got and I'm pretty sure I did them correctly. The accepted value for absolute zero is -273C. The value I got when calculating was -72.18 C. My question is can air be treated as an ideal gas so that the calculation on absolute zero is possible? If air can't be treated as an ideal gas then it would explain the huge difference in my value vs the accepted value.

Thanks!

ideasrule
Homework Helper
The ideal gas approximation is VERY good for air near room temperature. I'd say it's extremely accurate up to at least -100 degrees Celsius.

The ideal gas approximation is VERY good for air near room temperature. I'd say it's extremely accurate up to at least -100 degrees Celsius.

So that means I did something wrong right?

ideasrule
Homework Helper
Yes, I'd say so. You should be able to get a reasonable value (within 50 degrees or so of the actual answer).

Yes, I'd say so. You should be able to get a reasonable value (within 50 degrees or so of the actual answer).

ok. thanks for letting me know