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Unit Conversions, Pressure

  1. Feb 19, 2014 #1
    1. The problem statement, all variables and given/known data

    Hi. I am currently doing a lab where I need to convert mm Hg to atmospheres. When I try to use an online converter to do this, it gives two options for atmospheres, technical and standard. Which would be the best to use for a laboratory calculation?



    2. Relevant equations


    3. The attempt at a solution

  2. jcsd
  3. Feb 20, 2014 #2


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    Staff: Mentor

    I've never come across the unit "technical atmosphere." So unless the adjective "technical" is there, always take "atmospheres" to be the standard kind, with the abbreviated symbol atm, and with 1 atm = 101325 Pa.
  4. Feb 20, 2014 #3


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    Staff: Mentor

    According to wikipedia technical atmosphere is exactly 1 kg force over 1 square cm.

    1 at = 98.0665 kPa

    Go for the one standard one.
  5. Feb 22, 2014 #4
    760 mm Hg = 1 atm.

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