The compression ratio in an automobile engine is the ratio of the gas pressure at the end of the compression stroke to the pressure at the beginning. Assume that compression occurs at constant temperature. The total volume of a cylinder in a automobile is 441 cm³, and the displacement (the reduction in volume during the compression stroke) is 390 cm³. What is the compression ratio in that engine?

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According to Boyles law pressure is inversely proportional to volume at constant temperature He... View the full answer