The Celsius scale, of course. Though it is also known as the centigrade scale.
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100 degrees on the Celsius scale, 212 degrees on the Fahrenheit scale, 373 Kelvins, and 671 degrees (rounded) on the Rankine scale are all the same temperature.
The Greeks had simple thermometers in the first century BC. Galileo Galilei (1564-1642) Italian physicist, invented a basic air thermometer. Daniel Gabriel Fahrenheit (1686-1736) was the German physicist who invented the alcohol thermometer in 1709, and the mercury thermometer in 1714. In 1724, he introduced the temperature scale that bears his name - Fahrenheit Scale. The Celsius scale, invented by Swedish Astronomer Anders Celsius (1701-1744), has 100 degrees between the freezing point (0 C) and boiling point (100 C) of pure water at sea level air pressure. The Celsius temperature scale is also referred to as the "centigrade" scale. Centigrade means "consisting of or divided into 100 degrees". The term "Celsius" was adopted in 1948 by an international conference on weights and measures.
A temperature change by one degree on Celsius scale equals temperature change of 1.8 degree on Fahrenheit scale or F (Fahrenheit) = 1.8 C (Celsius) + 32
Use a thermometer.
The Celsius scale is also known as the Centigrade scale.