Two non-SI pressure units are still in everyday use. Which pairing of unit and application matches usual practice?
AMillibars for tyres, pascals for blood
BMillimetres of mercury for tyre pressure
CPounds per square inch for tyre pressure
DPounds per square inch for blood pressure
Answer & Solution
Correct answer: C. Pounds per square inch for tyre pressure
1. Pounds per square inch is still sometimes used as a measure of tyre pressure.
2. Millimetres of mercury is still often used for blood pressure.
3. So the correct pairing is pounds per square inch with tyre pressure.
4. Swapping the two units, as in the mercury and blood pressure options, reverses the usual practice.
5. Millibars belong to meteorology, where atmospheric pressure is often quoted in them.
_Source: OpenStax College Physics (CC BY 4.0), Ch 11 "Fluid Statics", section 11.3 Pressure_
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