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Thermometers: Understand the options

Types of thermometers

A thermometer measures body temperature by sensing how certain materials change when they get warmer or cooler. (3p3; 8p1) Body temperature can be measured by infrared rays or by how heat changes a liquid, metal, gas or electric signal in a thermometer.

There are two types of thermometers.

  • Contact thermometers must touch the body to measure temperature.
  • Contactless thermometers can measure body temperature without touching the skin.