Question

Absolute value of internal energy can be easily measured.

• A. True
• B. False

Answer 1

The correct option is B

False

Internal energy of a system is nothing but the sum of translational, rotational, vibrational, electronic, nuclear etc energies of the molecules in the system.
$\therefore$ Internal energy = Translational + rotational + vibrational + electronic + nuclear + . . . . . .
The method to calculate absolute values of all the energies at a given state is not available. Therefore absolute value of internal energy measurement is not possible.

We always measure the CHANGE in internal energy.