Answer :
Final answer:
To convert tire pressure from psi to atmospheres, divide by 14.7. To convert psi to millimeters of mercury (mm Hg), multiply by 51.7. The absolute pressure is the sum of the gauge pressure and atmospheric pressure.
Explanation:
Expressing tire pressure in atmospheres and millimeters of mercury (mm Hg) requires understanding the conversion of pressure units. 'Psi' stands for pounds per square inch, which is a standard unit of pressure. You can convert psi to atmospheres by dividing psi by 14.7, since 1 atmosphere equals 14.7psi. To convert psi to millimeters of mercury (mm Hg), you should multiply psi by 51.7 because 1 psi equals 51.7 mm Hg.
For example, if a tire gauge reads 34 psi, the absolute pressure in atmospheres is 34 psi divided by 14.7, and in millimeters of mercury it is 34 psi multiplied by 51.7.
Remember, the absolute pressure is the sum of the gauge pressure (read pressure) and atmospheric pressure. The atmospheric pressure at sea level is typically around 14.7 psi or 1 atm or 760 mm Hg. Therefore, if your tire gauge reads 34 psi, then the absolute pressure is 34 psi plus 14.7 psi (atmospheric pressure in psi), or 48.7 psi.
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