Which term describes a system that remains constant through ongoing exchange with its environment?

Which term describes a system that remains constant through ongoing exchange with its environment?

• A. Equilibrium
• B. Entropy
• C. Steady State
• D. Balance

Answer: (C)

Steady state describes a system where, even though matter or energy is continually flowing in and out with the environment, the key properties stay essentially constant because inflows balance outflows. This means the internal conditions don’t change over time even though processes are dynamic. A good mental image is a river in a steady state: water and nutrients move through, but the concentration and overall conditions remain steady because inputs and outputs match. In biology or chemistry, cells or reactors can maintain constant concentrations or temperatures this way. Equilibrium, by contrast, implies no net exchange with the surroundings—the system is at rest with no ongoing flows. Entropy relates to disorder and decay toward greater disorder, not to a constant state maintained by continuous exchange. Balance is too vague to capture the dynamical balance described by steady state.

Steady state describes a system where, even though matter or energy is continually flowing in and out with the environment, the key properties stay essentially constant because inflows balance outflows. This means the internal conditions don’t change over time even though processes are dynamic. A good mental image is a river in a steady state: water and nutrients move through, but the concentration and overall conditions remain steady because inputs and outputs match. In biology or chemistry, cells or reactors can maintain constant concentrations or temperatures this way.

Equilibrium, by contrast, implies no net exchange with the surroundings—the system is at rest with no ongoing flows. Entropy relates to disorder and decay toward greater disorder, not to a constant state maintained by continuous exchange. Balance is too vague to capture the dynamical balance described by steady state.