## Celsius.

Celsius – a widely used unit of temperature in the International system of units (SI), along with Calvin. Celsius as a unit of measurement has the symbol °C.

Celsius as a unit of measurement

The story of the emergence of a degree Celsius

A converting temperature in Celsius to temperature in other scales – formula

__Other units of measurement__

## Celsius as unit of measure:

**Celsius** – a widely used unit of temperature in the International system of units (SI), along with Calvin, named after the Swedish scientist Anders Celsius, who proposed in 1742 a new scale for measuring temperature.

However, according to the SI Brochure published by the International Bureau of weights and measures (BIPM) which is the full official description of the SI, together with her interpretation of “regulation on measurement units admitted for application in Russian Federation”, approved by Government Decree by RF Government of 31 October 2009 # 879, GOST 8.417-2002 “physical Units” Celsius is not a unit of temperature, and the unit of temperature is Celsius.

**Celsius** as a unit of measurement has the symbol °C.

**One degree Celsius** equals one Kelvin (K), and zero of Celsius scale is set so that the temperature of the triple point of water is 0.01 °C.

In the end, of the scale of Celsius and Kelvin are shifted by 273,15 units relative to each other.

tC = tK – 273,15.

tK = tC + 273,15.

**Celsius** refers to the derived SI units. The basic unit of measure is Kelvin. Kelvin is a unit of thermodynamic temperature in the International system of units (SI).

In the International system of units Celsius introduced by the decision of the XI General conference on weights and measures in 1960, simultaneously with the adoption of the SI as a whole. In accordance with the rules SI, and relating the derived units are named for scientists, the name of the unit “Celsius” is spelled with a lowercase letter (except for the names of the scientist after whom this unit is named), and its designation — capital (°C). Such writing of the designation is stored in the symbols for derived units formed by using degrees Celsius.

## The history of Celsius:

Originally in 1665, Dutch physicist Christiaan Huygens and the English physicist Robert Hooke suggested the use of the melting point of ice and boiling water as reference points in the temperature scale.

Then in 1742, Swedish astronomer, geologist and meteorologist Anders Celsius based on the ideas developed the temperature scale which later became known by his name. However, initially it is zero degrees was adopted by the boiling point of waterand 100 degrees was adopted by the freezing point of water (melting point of ice).

After the death of Anders Celsius, his contemporaries began to use Celsius, but in the inverted and familiar to modern man. For 0 degrees Celsius began to take the temperature of melting ice (freezing of water) and 100 degrees Celsius – the boiling point of water). Since it is used currently.

Celsius scale is linear in the range of 0-100 °C and are also linearly continues in the region below 0 °C and above 100 °C.

**The use of Celsius:**

In Celsius temperature Celsius. Measured in Kelvin thermodynamic temperature.

## A converting temperature in Celsius to temperature in other scales – formula:

The conversion of the thermodynamic temperature (in Kelvin) to Celsius:

tC = tK – 273,15.

Conversion temperature Celsius to thermodynamic temperature (in Kelvins):

tK = tC + 273,15.

Conversion of temperature Fahrenheit to Celsius:

tC = (tF – 32) · 5 / 9.

Conversion temperature Celsius temperature Fahrenheit:

tF = tC· 9/ 5 + 32.

## Some key temperatures:

The temperature of absolute zero is -273,15 °C (0 K).

The boiling point of liquid hydrogen is equal to -252,87 °C (20,28 K).

The boiling point of liquid nitrogen is equal to -195,8 °C (77,4 K).

The point of intersection of the scales of Celsius and Fahrenheit at -40 °C (233,15 K)

The melting point of ice is equal to -0,0001 °C (273,1499 K), but is taken as zero degrees Celsius.

The temperature of the triple point of water is 0.01 °C (273,16 K).

Normal human body temperature of 36.6 °C (310 K).

The boiling point of water at 1 atmosphere pressure (101.325 kPa) is equal to 99,9839 °C (373,1339 K), but taken as 100 degrees Celsius.

Source: https://ru.wikipedia.org/wiki/Градус_Цельсия

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