ideal-gas specific heats of various common gases function of temperature

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재훈
재훈 2024-4-2
评论： Dyuman Joshi 2024-4-21
Ran in:
I know that the static pressure specific heat of air, an ideal gas, is 1.005, but in the one I made, it comes out to be 1.0002. What went wrong?
clc; clear all; close all;
M = 28.96;
T = 273.15;
a=28.11; b=0.1967E-2; c=0.4802E-5; d=-1.966E-9;
dcp=(a+(b.*T)+(c.*(T.^2))+(d.*(T.^3)));
cp = dcp./M;
disp(cp);
1.0002
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Dyuman Joshi
Dyuman Joshi 2024-4-3
编辑：Dyuman Joshi 2024-4-3
Unfortunately, NIST has not published any data regarding Shomate polynomials of Air (If I had to guess why - I would say it is probably because air is a mixture of different elements and compounds, thus it woud be difficult to obtain data for it).
I could only find the values for N2, O2, H2, H2O and CH4.
재훈
재훈 2024-4-12
Sorry for the late reply. Thanks for looking into the values. But I don't think it's needed now. Nonetheless, thank you for your help and have a nice day :) cheerio(I actually finished the assignment and it's all thanks to you).

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VBBV
VBBV 2024-4-2
编辑：VBBV 2024-4-2
Ran in:
Hi @재훈 if you consider a change in sign for the last term it would result in 1.005
M = 28.9; % assune
T = 273.15;
a=28.11; b=0.1967E-2; c=0.4802E-5; d=-1.966E-9;
dcp=(a+(b.*T)+(c.*(T.^2))-(d.*(T.^3)));
%changge in sign here
cp = dcp./M;
disp(cp);
1.0050

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