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Boy measuring his temperature

Boy measuring his temperature

M833/0111

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

Strip thermometer. Boy using a strip thermometer to measure his temperature from his forehead. His temperature is displayed by the green area, which in this case shows 38 degrees Celsius. This indicates that he has a slight fever: normal body temperature is a degree lower than this. The cells in the strip each contain liquid crystals in a tight helix. The crystals are designed so that they expand and begin to reflect light at a specific activation temperature. Each cell's crystals have a slightly different activation temperature. Fevers can be reduced with drugs, but most are short-lived and harmless. Skin thermometers are less accurate than mercury or digital types.

Release details

Model release available. Property release not required.

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