ineed to find an official source for the gas properties Cp and Cv, ie not just a table on the web. is there a body who record and publish stuff like this, ie british standards or api or iso or somthing


cheers iin advance

liam

are you looking for the perfect gas approximations or the real data?

if its the first then im not sure there are standards (ill check the bs/iso ones later) for the real data there are international standards for them but they just cover particular areas like the iapws for steam tables.

my thermodynamics data book normally quotes where the data came from but doesnt for the prefect gas stuff, couldnt you get a well known textbook on the subject and quote that as your reference?

In the old days it would be NPL or NEL as the national reference --- in this post-Thatcher world god knows who looks after the standard.

The NPL (National Physics Laboratory) should have the info you need.

I have some 'official' data provided by the university in their engineering data book.

Let me know what gas you need and I will see if its in the list.

Cheers,
David

Which gas type do you want the values for?

G20 aka natural gas
G30 aka butane
G31 aka propane?