Specific heat ratios of water, air, and related questions

[sempiris]

I've been working on a research project and I'm having difficulty with finding heat capacity values/heat capacity ratios. I have been getting 1.33 for the gamma value of steam, and 1.4 for air (at 300K). I was hoping someone could confirm these values.

also, I have a question...let's say we have a sample of humid water, and i need to find the heat capacity ratio for that sample: would I do it by averaging the heat capacity ratios for steam and air relative to their % mass in the sample?


thank you ahead of time.

 

[Cyrus]

The Cp and Cv values of gases should be given in the back of any thermodynamics book for various temperatures and pressures.