90
100
0
C. The scale in between these points was divided into 100 equal degrees and was
called a Centigrade or the Celsius scale. The scale was simpler than Fahrenheit’s, and
was soon adopted by scientists throughout the world. In 1948 it became officially
known as the Celsius scale, which is now part of the International System of Units.
Another temperature scale was made in 1848 by
Scottish physicist William
Thomson-Lord Kelvin (1824 – 1907). Kelvin knew that when oxygen and other gases
were cooled, their volume became smaller. The lower the t
0
, the smaller the volume.
Experiments proved that at certain t
0
the
molecules do not move, and their energy
becomes zero. That represented the lowest possible temperature, and was called
absolute zero on the Kelvin temperature scale. On the Celsius
scale absolute zero is -
273,15
0
C.
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