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Compression Ratio:

The compression ratio is the difference between the volume in one cylinder at bottom dead center (BDC),

 
 to the volume at top dead center (TDC).

Example: If a cylinder had a 50 cu. in. volume at BDC and a 5 cu. in. volume at TDC.
You would have compressed that volume 10 times (10:1). 50/5=10