# Calculate final temperature of a gas undergoing an expansion in several ways.

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A perfect gas occupying 0.2 cubic meters at a pressure of 1240 Kpa and a temp of 150 deg Celsius is expanded to 0.5 cubic meters. What is the final temp if the expansion takes place in the following ways: at constant pressure, Isothermally and according to the law pv^1.25=Constant?

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The solution provide the formulas needed to work the problem, and includes an calculated answer.

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Let us denote the pressure, volume, and temperature at the beginning by P0,V0 and T0 respectively, and denote the pressure, volume, and temperature at the end by P,V and T ...

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- BSc , Wuhan Univ. China
- MA, Shandong Univ.

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- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
- "Thank you"
- "Thank you very much for your valuable time and assistance!"

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