The Celsius scale is widely used in most countries and in scientific applications.

It is based on the properties of water:

0°C = Freezing point of water

100°C = Boiling point of water (at standard atmospheric pressure)

The Celsius scale is a part of the metric system and is used in most scientific calculations.

Conversion formulas involving Celsius:

Celsius to Kelvin:

K = °C + 273.15
°F = (°C × 9/5) + 32

The Kelvin scale is the SI (International System of Units) standard for temperature.

It is an absolute temperature scale, meaning 0 K is the absolute lowest possible temperature (absolute zero), where all molecular motion stops.

The Kelvin scale does not use the degree symbol (°) and does not have negative values.

Important reference points:

0 K = Absolute zero

273.15 K = Freezing point of water

373.15 K = Boiling point of water

Conversion formulas involving Kelvin:

Kelvin to Celsius:

°C = K - 273.15

°F = (K - 273.15) × 9/5 + 32

The Fahrenheit scale is mainly used in the United States and some Caribbean countries.

It was developed by Daniel Gabriel Fahrenheit.

It is based on:

32°F = Freezing point of water

212°F = Boiling point of water (at standard atmospheric pressure)

Conversion formulas involving Fahrenheit:

Fahrenheit to Celsius:

°C = (°F - 32) × 5/9

K = (°F - 32) × 5/9 + 273.15