Degree symbol copy from here

°

Kelvin and Celsius scales are mostly used temperature scales in thermometer The capacity of 1 degree on the Kelvin scale is similar to the capacity of 1 degree on the Celsius scale i.e, the difference in temperature is similar on both the Scales. The Kelvin and Celsius conversion is as below

0 degrees Kelvin scale = -273.15 degrees Celsius

0 K = -273.15 °C

The temperature T in degrees Celsius (°C) is equal to the temperature T in Kelvin (K) minus 273.15:

T(°C) = T(K) – 273.15

For Example

Convert 700 Kelvin to degrees Celsius:

T(°C) = 700K – 273.15 = 426.85 °C

- Kelvin temperature scale is the most used as an absolute temperature scale in the whole world. Here is a definition of this scale and its history and uses.

**Kelvin Temperature Scale**

- The Kelvin temperature scale is the absolute temperature scale that is determined using the third law of thermodynamics.
- Because it is an absolute scale, the temperature in degrees Kelvin recorded does not have a degree.
- The zero points of the Kelvin scale is equal to absolute zero, which is when particles have minimal kinetic energy and cannot get colder.
- Each block (degree, on other scales) is 1 part in 273.16 parts of the difference between absolute zero and the triple point of water. This is the same block size as degrees Celsius.

**Kelvin Temperature Scale Definition**

The Kelvin temperature scale is the absolute temperature scale with zero at absolute zero . Because this is an absolute scale, a measurement made using the Kelvin scale does not have a degree. Kelvin (note the lowercase letter) is the basic unit of temperature in the International System of Units (SI).

**Definition Changes**

Until recently, the Kelvin scale unit was based on the determination that the volume of gas at constant (low) pressures is directly proportional to temperature and that 100 degrees separates the freezing and boiling points of water.

Now, the Kelvin block is determined by the distance between the absolute zero and the triple point of water. Using this definition, one Kelvin is the same magnitude as one degree on the Celsius scale, which makes it easy to convert between Kelvin and Celsius measurements.

On November 16, 2018, a new definition was adopted. This definition sets the Kelvin block size based on the Boltzmann constant. As of May 20, 2019, Kelvin, mole, and amperes will be kilogram using thermodynamic constants.

**Absolute zero**

Kelvin temperature is written with a capital “K” and without a degree symbol, such as 1 K, 1120 K. Note that 0 K is “absolute zero”, and there are (usually) no negative Kelvin temperatures.

**History**

- William Thomson, later named Lord Kelvin, wrote an article
*on the Thermometric absolute scale*in 1848. He described the need for a zero-point temperature scale at absolute zero, which he calculated equivalent to -273 ° C. The Celsius scale at that time was determined using a freezing point water. - In 1954, the 10th General Conference on Weights and Measures (CGPM) formally defined the Kelvin scale with a zero point of absolute zero, and the second point determining the triple point of water, which was defined as exactly 273.16 Kelvin. At this time, the Kelvin scale was measured using degrees.
- 13 GK changed the units of the scale from “Kelvin degrees” or ° K to Kelvin and the symbol K. 13 GK also defined blocks as 1 / 273.16 temperature of the triple point of water.
- In 2005, a subcommittee of the Civil Code, at Comité International Measures and Scales (CIPM), indicated a triple point of water refers to a triple point of water with an isotopic composition called Vienna Standard Ocean Water.
- In 2018, 26 – the Civil Code redefined Kelvin with a Boltzmann point of view of a constant value of 1,380649 × 10
^{-23}J / K. Although the block has been redefined over time, the practical changes in the block are so small that they do not have a significant impact on most people working with the device. However, it is always a good idea to pay attention to significant digits after the decimal point when converting between degrees Celsius and Kelvin.