Help!! i need help with B and number 14

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?

Whithin which type of system is neither the total mass nor the total energy conserved ? a. open b. connected c. isolated d. closed