Thermometer is one of the most commonly found first aid instruments in almost every home. The thermometer was not a single invention, however, but a development.
A primitive type of thermometer was mentioned by the Greek physicist, Hero of Alexandria in the second century BC. In 1592, Galileo devised an instrument similar to the modern-day thermometer, consisting of a glass bulb a glass tube, which he immersed in water. Ferdinand II, Grand Duke of Tuscany, is credited with developing the first thermometer that stays unaffected by atmospheric pressure.
Daniel Gabriel Fahrenheit from Germany made the first reliable thermometers, and the temperature scale he created is named after him. He made thermometers replacing water with mercury. In 1742, Swedish astronomer, Anders Celsius invented the Celsius temperature scale. In 1866, Sir Thomas Allbutt invented a clinical thermometer for measuring body temperature.
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