You can't convert a RATIO (which is a pure number) to a MEASUREMENT such as psi. You get such a ratio by dividing two different pressures, for example.
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Compression ratio is a ratio of the volume of gas in an engine's cylinder before and after combustion. To convert compression ratio to psi (pounds per square inch), you would need additional information such as the specific engine's cylinder volume, operating conditions, and fuel type to calculate the pressure generated during combustion. It is not a direct conversion and depends on various factors specific to the engine.
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To calculate the air pressure at the end of the compression process in an ideal Otto cycle, you can use the formula for isentropic compression: P2 = P1 * (V1/V2)^gamma, where gamma is the specific heat ratio (1.4 for air). Given the compression ratio is 7, the volume ratio V1/V2 is 7. So, P2 = 98 kPa * (1/7)^1.4 ≈ 26.03 kPa.
Helium loses its buoyancy when it reaches a compression ratio that increases its density to be equal to or greater than the density of air. This usually occurs at a compression ratio of around 1.7 to 2.0 times the original volume.
The compression ratio of a Kohler 12hp motor varies depending on the specific model and design. It can typically range from 9:1 to 10:1, meaning that the volume in the combustion chamber is compressed to roughly 1/9th to 1/10th of its original volume before ignition. This compression ratio helps improve the engine's efficiency and power output.