precautions while using laboratory thermometers

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Precautions while using Laboratory Thermometers

The precautions to be observed while reading a laboratory thermometer.

This filledsystem thermometer utilizes the vapor pressure of certain stable liquids to measure temperature. The useful portion of any liquidvapor pressure curve is between approximately 15 psia (100 kilopascals absolute) and the critical pressure, that is, the vapor pressure at the critical temperature, which is the highest temperature for a particular liquidvapor system. A nonlinear relationship exists between the temperature and the vapor pressure, so the motion of the bourdon tube is greater at the upper end of the vaporpressure curve. Therefore, these thermal systems are normally used near the upper end of their range, and an accuracy of 1% or better can be expected.

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