Original: If each stage has a compression ratio of 7 to 1, the compressor can output 343 times atmospheric pressure (7 Ã - 7 Ã - 7 = 343 atmospheres).
Simplified: If each stage has a compression ratio of 7 to 1, the compressor can output 343 times atmospheric pressure (7 x 7 x 7 = 343 Atmospheres).