Celsius scale

The Fahrenheit scale was commonly used, but phase changes were set at awkward quantities: melting at 32 F and boiling at 212 F. Celsius rationalized this by setting them to 0 and 100 respectively.
 Anders Celsius Sweden 1742 Celsius scale

The Fahrenheit scale was commonly used, but phase changes were set at awkward quantities: melting at 32 F and boiling at 212 F. Celsius rationalized this by setting them to 0 and 100 respectively.