celsiusasteikkoon

The Celsius scale, often referred to as the centigrade scale, is a unit of measurement for temperature. It was originally developed by Swedish astronomer Anders Celsius in 1742. The scale is defined by two fixed points: the freezing point of water at standard atmospheric pressure, which is set at 0 degrees Celsius (°C), and the boiling point of water at standard atmospheric pressure, which is set at 100 degrees Celsius (°C). The interval between these two points is divided into 100 equal degrees.

The Celsius scale is widely used around the world for everyday temperature measurements, in scientific contexts, and in meteorological reporting. It is part of the International System of Units (SI) although the kelvin is the SI base unit for temperature. The conversion formula from Celsius to Fahrenheit is °F = (°C × 9/5) + 32, and from Fahrenheit to Celsius is °C = (°F − 32) × 5/9. While Fahrenheit is still commonly used in countries like the United States, Celsius is the predominant scale globally. The scale has undergone minor adjustments since its inception to refine the definition of its fixed points, but the fundamental principle of 100 degrees between the freezing and boiling points of water remains.