Asked in SciencePhysicsTemperature
What instrument measures temperature?
October 21, 2017 1:56AM
Most commonly, a thermometer.
Thermometers are used to measure the increase or decrease in the temperature of a system as it gains or loses internal energy.
An alcohol-in-glass thermometer has been the most common personal instrument used to measure temperature. Mercury thermometers are still around but are no longer offered for sale. Today, digital devices are available that scan the forehead or ear. Some other devices used to measure temperature are:
Radiation pyrometer, for extremely high temperatures;
Glass thermometer: mercury or alcohol;
Thermistor (thermal resistor)
Platinum resistance thermometer (a resistance detector);
A mercury in glass thermometer uses mercury liquid contained within its glass structure to be subjected to heat.
the heat causes the mercury fluid to expand along the glass tube
and the total amount of expansion can be seen as a measure
along the accurate scale of indication.
This is a direct indication of the effects of temperature.
A more complex method of measuring temperature could be a
thermocouple measuring device.
A thermocouple consists of 2 dissimilar types of metal materials in the form of wires , which are joined at 1 end by weld/ fusion.
this single joined end is called the hot junction. The other end of the 2 wires are then terminated at separate junctions;
as in a electronic terminal block. This end of the 2 wires can be called the cold junction.
For most accurate temperature measure, I think temperature sensor is the first choice.