Fahrenheit is a temperature scale based on one proposed in 1724 by the physicist Daniel Gabriel Fahrenheit (1686–1736) that uses the degree Fahrenheit as the unit. It is named after the astronomer and physicist Gabriel Fahrenheit (1686–1736). On the original scale, the freezing point of water is 32 degrees, and the boiling point 212 degrees. The unit is also known as Farenheit or Reaumur. In science and in cooking, the Fahrenheit scale is commonly used in the USA. This temperature scale was named after an astronomer named Gabriel Daniel Fahrenheit (1686-1736). The Celsius unit of temperature is named after a Swedish astronomer Anders Celsius (1701-1744).

Celsius (abbreviation: °C) is a temperature scale with the freezing point of water and the triple point of water being defined as 0 degrees Celsius (or °C), and the boiling point of water being defined as 100 degrees Celsius (or °C). This scale is widely used in science, particularly in countries where the metric system is widely used, although it is officially limited to temperatures between −50° and 100°. It is also the basis of a number of other scales, including the APH (Atmospheric Pressure-based Humidity) scale and the ANSI standard for reporting weather temperatures. Celsius is named after the Swedish astronomer Anders Celsius. The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval, a difference between two temperatures or an uncertainty. For example, it may be used to describe the temperature at which water boils, or that at which the pressure of a given gas is equal to 1 atmosphere (atm).