Question

At any given state the specific internal energy of a gas is always greater its specific enthalpy. a)True b) False

Answer 1

(b)False

Step-by-step explanation:

We know that specific Internal energy of gas u=
`C_v`T

and specific enthalpy of gas h=
`C_p`T

If we take the case of air we know that

`C_v`=0.707 KJ/Kg=K ,
`C_p`=1.005 KJ/Kg=K

If we take A fixed temperature T=300 K

so u=212.1 KJ/ kg ,h=301.5 KJ/kg

So we can say that specific enthaply of gas is always greater than its specific internal energy.