Temperature measurement is a vital aspect of understanding heat and maintaining thermal equilibrium. Various temperature scales have been developed over time to quantify thermal conditions. The three most commonly used scales are: Celsius (°C), Fahrenheit (°F), and Kelvin (K). Each scale has its own unique characteristics and origins.

The Celsius scale, also known as the centigrade scale, is widely used in most parts of the world. It is based on the properties of water, with 0°C representing the freezing point and 100°C representing the boiling point under standard atmospheric pressure.

The Fahrenheit scale, primarily used in the United States, originated from the freezing and boiling points of a brine solution. 32°F represents the freezing point of water, and 212°F signifies its boiling point.

The Kelvin scale, on the other hand, is an absolute temperature scale. It starts from absolute zero, which is the lowest possible temperature where all molecular motion ceases. The Kelvin scale is often used in scientific calculations and is denoted by the symbol K.