When a system in a given initial state experiences a series of processes and returns to the initial state, the system undergoes a _______.
A. system
B. surrounding
C. process
D. cycle
In an isobaric process, the _______ remains constant.
A. temperature
B. pressure
C. volume
D. entropy
The conservation of energy principle states that during an interaction, energy can change from one form to another but the total amount of energy _______.
A. remain constant
B. increase
C. decrease
D. fluctuate