Mayers Relation of specific heat

[Amith2006]

Sir,
Two expressions for relation between specific heats are given and it is asked to say which one is right. They are:
1)Cp – Cv = R
2)Cp – Cv = R/J
Which of the 2 is right? Here Cp and Cv are the specific heat of gas at constant pressure and volume respectively. R is universal gas constant and J is the mechanical equivalent of heat.

 

[maverick280857]

Sir,
Two expressions for relation between specific heats are given and it is asked to say which one is right. They are:
1)Cp – Cv = R
2)Cp – Cv = R/J
Which of the 2 is right? Here Cp and Cv are the specific heat of gas at constant pressure and volume respectively. R is universal gas constant and J is the mechanical equivalent of heat.

Both ...depends on what units you use.