Define specific impulse (Isp) and why it matters in propulsion performance.

Define specific impulse (Isp) and why it matters in propulsion performance.

• A. Isp is the total thrust produced per engine.
• B. Isp is the propellant mass per unit thrust.
• C. Isp is the thrust produced per unit of propellant flow, indicating propulsion efficiency and burn capability.
• D. Isp is the time it takes for the rocket to burn all its propellant.

Answer: (C)