Answer:
Steady state
Explanation:
Steady-state refers to the nonequilibrium state of any system. The system in the steady-state exhibits flow of matter and maintains a constant concentration of all the components.
Given that the system under study maintains the variable constant, the system is in steady-state. To maintain the variable constant, the system in the steady-state spends energy.
For example, the blood glucose level remains nearly constant since the rate of its synthesis and consumption balances each other. These metabolic processes require input of energy.