Most thermometers today use digital readouts and thermisters that have replaced mercury and other expanding liquids. Thermisters are resistors that change conductivity as temperatures rise, and this change in resistance to the conductivity is used to determine the temperature read out. These thermometers are not made out of glass and do not break easily from falls, thus being safer in a hospital setting. Other alternative thermometers, such as Galileo thermometers, use the density of liquids such as water or hydrocarbons to determine changes in temperature.
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