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techtalk:ref:engmech04r [2020/10/20 22:35] hippysmack [Measuring Engine Vacuum] |
techtalk:ref:engmech04r [2020/10/20 22:56] hippysmack [Measuring Engine Vacuum] |
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| Absolute pressure cannot be lower than absolute zero as that is its zero point. On the other hand, gauge pressure uses atmospheric pressure as its zero point. Even with varying atmospheric pressure, absolute pressure is always definite. Meanwhile, due to varying atmospheric pressure, the measurement of gauge pressure is not precise. Absolute pressure units are sometimes suffixed with the letter “a” whereas units for gauge pressure use “g” as a suffix. ((https://theydiffer.com/difference-between-absolute-pressure-and-gauge-pressure/)) \\ | Absolute pressure cannot be lower than absolute zero as that is its zero point. On the other hand, gauge pressure uses atmospheric pressure as its zero point. Even with varying atmospheric pressure, absolute pressure is always definite. Meanwhile, due to varying atmospheric pressure, the measurement of gauge pressure is not precise. Absolute pressure units are sometimes suffixed with the letter “a” whereas units for gauge pressure use “g” as a suffix. ((https://theydiffer.com/difference-between-absolute-pressure-and-gauge-pressure/)) \\ | ||
| - | ====== Measuring Engine Vacuum ====== | + | ====== Measuring Engine Crankcase Vacuum ====== |
| Engine vacuum is simply air pressure lower than (and is based on comparison with) atmospheric pressure. \\ | Engine vacuum is simply air pressure lower than (and is based on comparison with) atmospheric pressure. \\ | ||
