What is the freezing point of mercury thermometer?
Mercury cannot be used below the temperature at which it becomes solid, −38.83 °C (−37.89 °F).
Are thermometers still made with mercury?
What Will Replace Them? The National Institute of Standards and Technology (NIST) announced last week that it would stop calibrating mercury thermometers starting March 1 a move that brings the U.S. one step closer to phasing out these temperature-measuring devices for good.
Why is Celsius thermometer used?
Most scientific fields measure temperature using the Celsius scale. Zero degrees Celsius is the freezing point of water, and 100 degrees Celsius is the boiling point of water. Three nations do not use the Celsius scale.
How does a mercury thermometer work?
In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.
Does mercury have low freezing point?
With a freezing point of −38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest liquid state ranges of any metal.
Do mercury thermometers lose accuracy?
Mercury thermometers cannot be adjusted after calibration. The actual temperature must be calculated by applying corrections to the measured temperature. A digital thermometer does the math for you—the displayed temperature accurately represents the actual measured temperature.
Why is freezing 32 degrees?
The freezing temperature of water is 32 degrees Fahrenheit because of the unique characteristics of the water molecule, H2O. Molecules are always moving. Freezing happens when the molecules of a liquid get so cold that they slow down enough to hook onto each other, forming a solid crystal.
Can mercury thermometers stop working?
A separation of the mercury in your thermometer is not a defect! It is a condition, normally caused by shock in transit, which of course must be rectified before using the thermometer, or you will experience significant errors in your readings.
Does mercury Harden?
Solidifying Mercury The element mercury is a liquid at room temperature due to its weak atomic bonds. The melting point of mercury is -38.83 degrees Celsius, or -37.89 degrees Fahrenheit. Mercury can be solidified by cooling it to below its melting point.
What happens to mercury when frozen?
In 1911, Dutch physicist Heike Kamerlingh Onnes discovered the phenomenon of superconductivity by freezing mercury to only a few degrees above absolute zero. At that temperature, mercury loses all of its natural resistance to the flow of electricity and becomes superconductive.
