Question

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

Answer 1

Answer:

(b)False

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.