ADRIENNE HART-DAVIS / SCIENCE PHOTO LIBRARY ADRIENNE HART-DAVIS / SCIENCE PHOTO LIBRARY
Fever. Mercury thermometer showing a raised temperature of 39.5 degrees Celsius. This indicates a fever. Symptoms include shivering, sweating, thirst and hot skin. Normal body temperature varies between 36-38 degrees Celsius. This thermometer can measure body temperature in the mouth, underarm or rectum. It consists of a sealed narrow-bore glass tube with a bulb containing mercury (bottom left). Mercury (grey) inside the tube expands when heated and extends along the scale.
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