Mercury Barometer: Does Temperature Affect Height?

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SUMMARY

The temperature of mercury significantly affects the height of the mercury column in a barometer due to thermal expansion and variations in vapor pressure. Specifically, the thermal expansion coefficient of mercury is 0.0002 per degree Celsius. Below 320°C, the vapor pressure of mercury is less than 0.01 mm Hg, which is negligible for practical measurements. Calculating the temperature change required to induce a one mm Hg error is feasible using this coefficient.

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  • Understanding of thermal expansion principles
  • Familiarity with vapor pressure concepts
  • Basic knowledge of barometric measurements
  • Ability to perform calculations involving coefficients
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  • Research the thermal expansion properties of various liquids
  • Learn about the relationship between vapor pressure and temperature
  • Explore the design and calibration of barometers
  • Investigate the effects of temperature on other fluid dynamics
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Does the temperature of the mercury affects the height of the mercury column in a barometer?
 
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Yes, it does. Mercury is subject to thermal expansion and its vapor pressure varies with temperature.
 
touqra said:
Does the temperature of the mercury affects the height of the mercury column in a barometer?
The vapor pressure is less 0.01 mm Hg below 320 C; this would not be measurable.

The thermal expansion coefficient of mercury is 0.0002 per degree. You can calculate yourself the temperature change needed to get en error of one mm Hg.
 

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