Celsius is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. 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).

0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere with mercury being the working material. You can have also 30 degrees celsius converted to fahrenheit.

Throughout the world, except in a few other countries, the Celsius temperature scale is used for practically all purposes. The only exceptions are some specialist fields (e.g., low-temperature physics, light temperature in photography) where the closely related Kelvin scale dominates instead.

Almost the entire scientific field and many engineering fields, use the Celsius scale. However, some remain more accustomed to the Fahrenheit scale, which is the scale used in Weather forecasting, Measurement of body temperature and Household use such as cooking, (It is the scale commonly seen on ovens and in recipes). Do you know the answer of 30 degrees celsius celsius converted to fahrenheit?

Fahrenheit is the temperature scale proposed in 1724 by, and named after, the German physicist Daniel Gabriel Fahrenheit (1686–1736).

On the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point 212 °F (at standard atmospheric pressure), placing the boiling and freezing points of water exactly 180 degrees apart. A degree on the Fahrenheit scale is ¹⁄₁₈₀ of the interval between the freezing point and the boiling point. On the Celsius scale, the freezing and boiling points of water are 100 degrees apart.

The Fahrenheit scale was the primary temperature standard for Climatic, Industrial and Medical purposes. In the late 1960s and 1970s, the Fahrenheit scale was replaced by the Celsius (known until 1948 as centigrade) scale in most of the countries as part of a standardization called metrication.

But even now Fahrenheit is still used; in fields like the weather forecasting the reason is that the larger size of each degree Celsius (resulting in the need for decimals where integer Fahrenheit degrees were adequate for much technical work). For example, 68 °F, 69 °F, and 70 °F correspond to 20 °C, 20.6 °C, and 21.1 °C, respectively.