18 Questions
What is the pressure inside a sealed vessel measured relative to?
the pressure outside the vessel
A car tyre has been inflated to an indicated value of 30 psi at the local service station. What is the absolute pressure inside the tyre?
45 psi
What is the difference in magnitude between two pressure readings called?
differential pressure
What subscript is sometimes added to the unit to indicate a differential pressure measurement?
d
What is the pressure measured relative to atmospheric pressure called?
gauge pressure
What is the unit specified as to indicate gauge pressure?
psig
What is the reference point for absolute pressure measurement?
Perfect vacuum
What type of pressure measurement compares the pressures between two different places?
Differential pressure
What is the unit for atmospheric pressure in absolute pressure measurement?
psia
Why do deodorant spray cans warn against leaving them in direct sunlight?
Increasing the temperature of the gas increases the internal pressure
What type of pressure measurement is referenced to atmospheric pressure?
Gauge pressure
What is the notation used to indicate an absolute pressure measurement?
A subscript 'a'
Which unit is commonly used in Australian aviation to measure atmospheric pressure?
Hectopascals (hPa)
What is the standard atmospheric pressure in pascals (Pa)?
101325 Pa
Which unit is used to describe pressure in the English system of units?
Inches of mercury (in Hg)
What is the abbreviation for pounds per square inch used to measure pressure?
psi
Which unit is equivalent to 1 kilopascal (kPa)?
100 Pascals (Pa)
How is pressure often expressed in the context of 'atmospheres'?
Atmospheres (atm)
This quiz covers the concept of gauge pressure measurement, where the pressure inside a sealed vessel is measured relative to the pressure outside the vessel. Learn about the difference between gauge pressure and absolute pressure.
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