Celsius scale This temperature scale is a revised version of the Centigrade scale, first proposed by Anders Celsius (1701 – 44), Celsius Fahrenheit Scale

1. Celsius scale
This temperature scale is a revised version of the Centigrade scale,
first proposed in 1742 by Anders Celsius (1701 – 44), Swedish
astronomer. It is based on the ice point and steam point as the lower
and upper fixed points. The interval between these two fixed points is
divided into 100 equal divisions, each division is called degree Celsius
(symbol ºC). On the scale, the ice point is 0 ºC and the steam point is
100 ºC.

2. Fahrenheit scale
This temperature scale was invented in 1714 together with the
first mercury-in-glass thermometer by Gabriel Daniel Fahrenheit (1686
– 1736), German physicist. He set the zero of the temperature scale to
the melting temperature of a mixture of ice and salt (the lowest
temperature he could obtain in his day), and the temperature of his
own armpit as 96 degrees Fahrenheit (symbol ºF). By modern
definition, the ice point on this scale is 32 ºF and the steam point is 212
ºF. The range between these two fixed points, therefore, has 180 equal
parts. This scale is no longer in scientific use.
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