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Inevented the rudimentary water thermoscope or also known as the Galileo Thermometer.
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He iwas the first inventer to put a numerical scale on the thermoscope.
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He invented the first enclosed liquid-in-a-glass thermoneter.
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He invented the first modern thermoneter, which was the one with mercury in it.
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He invented the Celsius scale
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He invented the Kelvin scale