Compressor terminology: identify the parameter that equals work per cycle divided by stroke volume. Definition focus: In reciprocating compressors, the ratio (workdone per cycle)/(stroke volume) is called what? Choose the correct term.

Given data / Definition
Quantity of interest = (Workdone per cycle) ÷ (Stroke volume).

Concept/Approach
Mean Effective Pressure (MEP) is defined so that if it acted uniformly on the piston through the stroke volume, it would produce the same work as the actual cycle.

Step-by-step
W_cycle = MEP × V_strokeMEP = W_cycle / V_stroke

Why others are wrong
Compressor capacity is generally volumetric flow per unit time; compression ratio is p₂/p₁; compressor efficiency compares ideal vs actual work.

Final Answer
Mean effective pressure.