## Engineering Thermodynamics Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

(p1 v1 - p2, v2)/(γ - 1)
[m R (T1 - T2)] /(γ - 1)
All of these
[m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]

## Engineering Thermodynamics The polytropic index (n) is given by

log (v1/ v2)/ log (p1/p2)
log [(p1v1)/(p2v2)]
log (p2/ p1)/log (v1/ v2)
log (p1p2)/log (v1v2)

## Engineering Thermodynamics The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the specific heat at constant volume
Atomic mass of the gas and the gas constant

2.24 liters
224 liters
0.224 liters
22.4 liters

Maximum
Minimum
Zero
Negative

Three-forth
Two-third
One-third
One-half