Celsius is a temperature scale where water freezes at 0 degrees and boils at 100 degrees. It is widely used around the world to measure how hot or cold things are.
Named after Swedish astronomer Anders Celsius, who proposed a temperature scale in the 18th century. His original scale was actually reversed, with 0 as boiling and 100 as freezing, and later flipped to the modern form.
The Celsius scale is literally based on what water does—freeze and boil—so it’s tied to everyday life. Anders Celsius’s original scale ran backwards, so today’s 'normal' temperatures are actually a corrected version of his idea.
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