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Not all thermometers operate in the same way. Some use the thermal expansion of liquids and solids with temperature in order to work, others use the change in pressure of the gas which occurs with temperature change – either cooling or heating. We also have radiation type thermometers which are extremely popular – infrared ones. They measure the infrared energy which is emitted by an object. These thermometers are very popular because the user does not have to touch the object in any way – the measurement happens without it!

Alcohol and mercury are frequently used in thermometers – the reason is that even a very small change in the temperature does not go unnoticed.