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A tire-pressure gauge, or tyre-pressure gauge, is a pressure gauge used to measure the pressure of tires on a vehicle. Proper tire pressure is crucial for vehicle safety, fuel efficiency, and tire longevity. Tire gauges come in various types, including analog, digital, and dial gauges, each offering different features and accuracy levels.
A tire-pressure monitoring system (TPMS) monitors the air pressure inside the pneumatic tires on vehicles. [1] A TPMS reports real-time tire-pressure information to the driver, using either a gauge, a pictogram display, or a simple low-pressure warning light. TPMS can be divided into two different types – direct (dTPMS) and indirect (iTPMS).
Further, the vacuum in the gauge eventually deteriorates due to slow diffusion of gases through the mercury, making the device inaccurate. [8] In 1938, Adolph Zimmerli (1886–1967) [9] invented a gauge that overcame the filling problems, at least for pressures below ambient pressure. [10] Zimmerli's gauge consists of three relatively wide columns.
In SI units, 1 psi is approximately 6,895 pascals. The pound per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Since atmospheric pressure at sea level is around 14.7 psi (101 kilopascals), this will be added to any pressure reading made in air at sea ...
Strain gauge 1000 to 1 mbar Fast Mechanical Capacitance manometer Temperature fluctuations atm to 10 −6 mbar ±1% of reading Slower when filter mounted Mechanical McLeod Boyle's law 10 to 10 −3 mbar ±10% of reading between 10 −4 and 5⋅10 −2 mbar Transport Spinning rotor 10 −1 to 10 −7 mbar ±2.5% of reading between 10 −7 and 10 ...
1849 — Eugène Bourdon – Bourdon_gauge ; 1849 — Henri Victor Regnault – Hypsometer; 1864 — Henri Becquerel suggests an optical pyrometer; 1866 — Thomas Clifford Allbutt invented a clinical thermometer that produced a body temperature reading in five minutes as opposed to twenty. [14]
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