page_title: Tire-pressure gauge
hierarchical_section_title: Tire-pressure gauge
caption_attribution_description: English: Master Sgt. Warren Howard using a tire-pressure gauge to makes sure his tire pressure is at the proper level to give him added control of his car during a race.
context_page_description: A tire-pressure gauge, or tyre-pressure gauge, is a pressure gauge used to measure the pressure of tires on a vehicle.
  Since tires are rated for specific loads at certain pressure, it is important to keep the pressure of the tire at the optimal amount. Tires are rated for their optimal pressure when cold, meaning before the tire has been driven on for the day and allowed to heat up, which ultimately changes the internal pressure of the tire due to the expansion of gases. The precision of a typical mechanical gauge as shown is ±3 psi. Higher precision gauges with ±1 psi uncertainty can also be obtained.
context_section_description: A tire-pressure gauge, or tyre-pressure gauge, is a pressure gauge used to measure the pressure of tires on a vehicle. 
  Since tires are rated for specific loads at certain pressure, it is important to keep the pressure of the tire at the optimal amount. Tires are rated for their optimal pressure when cold, meaning before the tire has been driven on for the day and allowed to heat up, which ultimately changes the internal pressure of the tire due to the expansion of gases. The precision of a typical mechanical gauge as shown is ±3 psi (21 kPa). Higher precision gauges with ±1 psi (6.9 kPa) uncertainty can also be obtained.
caption: A tire-pressure gauge in use.  The example in this image is a Bourdon tube gauge. It is graduated in psi only.
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