A liquid thermometer works by using the thermal expansion of a liquid within a capillary tube to measure temperature. The precision of this method varies by the liquid used, but all use the fact that when most liquids ar... More »

Digital thermometers work on the principle that changes in temperature cause the resistance of a sensor to change allowing a computer to convert the difference to a digital read-out. The sensor is a thermoresistor, commo... More »

The red liquid inside of a thermometer is alcohol. When the temperature changes, the alcohol expands, providing a reading based on the thermometer's scale. Red dye is used to color the clear alcohol so that someone is ab... More »

A love thermometer refers to a toy known as a hand boiler, which uses a combination of temperature and pressure in an enclosed glass tube to appear as if the liquid boils just by placing hands on one of the ends of the d... More »

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A capillary tube uses a liquid’s properties of cohesion, adhesion and surface tension to draw the liquid up the interior walls of a narrow tube. This allows a liquid, such as blood or water, to climb up the tube even aga... More »

To read a thermometer, keep the thermometer in a vertical position so the liquid in the tube is upright. Keep eyes level with the top of the liquid in the tube. Avoid over-handling the thermometer as heat from another ob... More »

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Generally speaking, thermostats work by using a mercury switch that is in contact with a thermometer wire to trigger a temperature-adjustment lever in response to the expansion or contraction of the wires as they are hea... More »