If a compressor has a displacement of 10 cubic inches but actually pumps 6 cubic inches, what is its volumetric efficiency?

Volumetric efficiency is calculated by comparing the actual volume of air pumped by the compressor to the theoretical displacement of the compressor. In this scenario, the compressor has a displacement of 10 cubic inches but only pumps 6 cubic inches of air.

To find the volumetric efficiency, you use the formula:

Volumetric Efficiency (%) = (Actual Volume Pumped / Displacement Volume) x 100

Substituting the values into the formula gives:

Volumetric Efficiency = (6 cubic inches / 10 cubic inches) x 100 = 60%

Thus, the volumetric efficiency of the compressor is 60%. This figure reflects how effectively the compressor is operating in relation to its designed capacity, and a higher volumetric efficiency indicates better performance in converting input energy into useful work output.