If a faulty liquid-in-glass thermometer registers 103⁰C at the steam point and has no zero error, what will it register at 60⁰C?

If a faulty liquid-in-glass thermometer registers 103⁰C at the steam point and has no zero error, what will it register at 60⁰C?

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  • 1 month ago

    Depends on what is faulty.  If the "fault" is equal throughout (the fault is linear in behavior, which is a big assumption) then the reported value for a real value of 60 would be equal to 103/100 * 60.

    I can think of two very simple potentially non-linear causes of error though.  A localized narrowing of the tube is one (non-constant change in volume with change in distance along the tube), and non-systematic unequal separation between marks (numbering ticks or lines or whatever) is another.

  • 1 month ago

    then the scale factor is 103/100, that is, it reads 3% high

    60 x 1.03 = 61.8, rounded to 62º

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