Gauge Pressure Measurement
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Questions and Answers

What is the pressure inside a sealed vessel measured relative to?

  • the pressure outside the vessel (correct)
  • the pressure inside another vessel
  • standard atmospheric pressure
  • atmospheric pressure
  • 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?

  • 30 psi
  • 45 psi (correct)
  • 60 psi
  • 15 psi
  • What is the difference in magnitude between two pressure readings called?

  • absolute pressure
  • hydrostatic pressure
  • gauge pressure
  • differential pressure (correct)
  • What subscript is sometimes added to the unit to indicate a differential pressure measurement?

    <p>d</p> Signup and view all the answers

    What is the pressure measured relative to atmospheric pressure called?

    <p>gauge pressure</p> Signup and view all the answers

    What is the unit specified as to indicate gauge pressure?

    <p>psig</p> Signup and view all the answers

    What is the reference point for absolute pressure measurement?

    <p>Perfect vacuum</p> Signup and view all the answers

    What type of pressure measurement compares the pressures between two different places?

    <p>Differential pressure</p> Signup and view all the answers

    What is the unit for atmospheric pressure in absolute pressure measurement?

    <p>psia</p> Signup and view all the answers

    Why do deodorant spray cans warn against leaving them in direct sunlight?

    <p>Increasing the temperature of the gas increases the internal pressure</p> Signup and view all the answers

    What type of pressure measurement is referenced to atmospheric pressure?

    <p>Gauge pressure</p> Signup and view all the answers

    What is the notation used to indicate an absolute pressure measurement?

    <p>A subscript 'a'</p> Signup and view all the answers

    Which unit is commonly used in Australian aviation to measure atmospheric pressure?

    <p>Hectopascals (hPa)</p> Signup and view all the answers

    What is the standard atmospheric pressure in pascals (Pa)?

    <p>101325 Pa</p> Signup and view all the answers

    Which unit is used to describe pressure in the English system of units?

    <p>Inches of mercury (in Hg)</p> Signup and view all the answers

    What is the abbreviation for pounds per square inch used to measure pressure?

    <p>psi</p> Signup and view all the answers

    Which unit is equivalent to 1 kilopascal (kPa)?

    <p>100 Pascals (Pa)</p> Signup and view all the answers

    How is pressure often expressed in the context of 'atmospheres'?

    <p>Atmospheres (atm)</p> Signup and view all the answers

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