Compressor capacity: It is the quantity of air delivered by a compressor in m3/minute or m3/sec.

Compression ratio: It is defined as the ratio of volume of air before compression to the volume of air after compression. It is the ratio of total volume (V1) to the clearance volume (VC).

In other words, the compression ratio is volume of air before compression to the volume of air after compression.

Explanation:

Compressor capacity: It is the quantity of air delivered by a compressor in m3/minute or m3/sec.

Compression ratio: It is defined as the ratio of volume of air before compression to the volume of air after compression. It is the ratio of total volume (V1) to the clearance volume (VC).

In other words, the compression ratio is volume of air before compression to the volume of air after compression.