Means of measuring temperature other than thermocouples

“Other Means Of Measuring Temperature Than Thermocouples”



1. Thermometers



One of the most popular methods of measuring temperatures is using a thermometer. The bulb thermometer is the most common glass thermometer. It contains some type of liquid, which is generally mercury. The principle, that bulb thermometers work, is that a liquid changes its volume relative to its temperature. Therefore, liquids occupy less space when they are heated.

Galileo invented the first thermometer. It was an air thermometer consisting of a glass bulb with a long tube attached. When, the dupe was dipped into a cooled liquid the bulb was warmed, expanding the air inside. As the air continued to expand, some of it escaped. When the heat was removed, the remaining air contracted causing the liquid to rise in the tube indicating a change in temperature. However, the Galileo type thermometer is very sensitive, it is not too practical because it can be affected by small changes it atmosp...