Boy measuring his temperature

Boy measuring his temperature

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Credit: 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.

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Keywords: boy, care, checking, child, colour, colours, crystals, diagnosing, diagnosis, fever, forehead, healthcare, ill, lcd, liquid crystal, male, measurement, measuring, medical, medicine, patient, sick, thermochromic strip, thermometer, unwell, young

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