Internal Combustion Engines
Compression ratio of I.C. Engines is

Ratio of pressure after compression and before compression
The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Swept volume/cylinder volume
Volume displaced by piston per stroke and clearance volume in cylinder

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Internal Combustion Engines
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)

All of these
P = [(W - S) π (D + d) N]/60 watts
P = (Wl × 2πN)/60 watts
P = [(W - S) πDN]/60 watts

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