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2. MAP sensor - Wikipedia

   en.wikipedia.org/wiki/MAP_sensor

   Engine vacuum is the difference between the pressures in the intake manifold and ambient atmospheric pressure. Engine vacuum is a "gauge" pressure, since gauges by nature measure a pressure difference, not an absolute pressure. The engine fundamentally responds to air mass, not vacuum, and absolute pressure is necessary to calculate mass.

3. Draft (boiler) - Wikipedia

   en.wikipedia.org/wiki/Draft_(boiler)

   In a water boiler, draft is the difference between atmospheric pressure and the pressure existing in the furnace or flue gas passage. [1] Draft can also be referred to as the difference in pressure in the combustion chamber area which results in the motion of the flue gases and the air flow.

4. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Gauge pressure is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. A tire pressure gauge is an example of gauge pressure measurement; when it indicates zero, then the pressure it is measuring is the same as the ambient pressure.

5. Rupture disc - Wikipedia

   en.wikipedia.org/wiki/Rupture_disc

   A rupture disc (burst) Pressure-effect acting at a rupture disc A rupture disc, also known as a pressure safety disc, burst disc, bursting disc, or burst diaphragm, is a non-reclosing pressure relief safety device that, in most uses, protects a pressure vessel, equipment or system from overpressurization or potentially damaging vacuum conditions.

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7. Duct leakage testing - Wikipedia

   en.wikipedia.org/wiki/Duct_leakage_testing

   Small pressure pan application. A third test method to determine if ductwork is leaking to the outside is to use a pressure pan, which is a register cover with a pressure tap for a hose connection. With the house pressurized (or depressurized) to 50 Pa (-50 Pa) using a blower door, a pressure gauge is attached to the pressure pan by means of a ...

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9. David Muir Accused Of Vanity In Live Fire Coverage, But There ...

   www.aol.com/david-muir-accused-vanity-live...

   But someone whom Mediaite identified as a “source familiar with Muir’s live hit” told the outlet: “This was 30 seconds before air, a producer stepped in to try to fix [his] coat in the wind.