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Gauge pressure

  1. Apr 18, 2012 #1
    good day!

    i was asked to solve for gauge pressure, pg1, using the combined Boyle's and Charle's Law,

    (pg1V1)T1=(pg2V2)T2

    where V is the volume of gas and T is the temperature (in °C). now here's my question, we know that in computing for absolute pressure we need to convert the temperature to Kelvin (or Rankine) if the given is in °C, since gauge pressure is the difference between the absolute and atmospheric pressure, do i need to convert the given temperature in °K?

    thanks and GB!
     
  2. jcsd
  3. Apr 18, 2012 #2
    Yes, you need, because Boyle's and Charle's Law are derived form ideal gas formula (pV=nRT=NkT) where temperatures are given in Kelvins. If you put Celsius you will have different dimensions.
     
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