Theory:

The degree of hotness or coolness of a body is measured by its temperature. The higher the temperature, the hotter the body.
 
Kelvin is the SI unit of temperature (\(K\)). Celsius (\(°C\)) is used in everyday applications. A thermometer is used to determine the temperature.
 
There are three temperature scales, they are
  • Fahrenheit scale
  • Celsius or Centigrade scale 
  • Absolute scale or Kelvin scale
 
Fahrenheit scale:
The freezing and boiling points in Fahrenheit are \(32\) degrees Fahrenheit and \(212\) degrees Fahrenheit, respectively. The interval has been broken down into \(180\) segments.
 
Celsius scale:
The freezing and boiling points on the Celsius scale (also known as the centigrade scale) are \(0°C\) and \(100°C\), respectively. The interval has been broken down into \(100\) pieces.
The formula to convert a Celsius scale to Fahrenheit scale is:

F=95(C+32)
The formula for converting a Fahrenheit scale to Celsius scale is:

C=59(F32)
 
Kelvin scale(Absolute scale):
 
Kelvin scale is also known as the absolute scale.  Absolute zero, or \(0\) \(K\) on the Kelvin scale, is the temperature at which a substance's molecules have the lowest possible energy. At \(273.16\) \(K\), the solid, liquid, and gaseous phases of water can coexist in equilibrium.
Kelvin is defined as \(1/273.16\) of the triple point temperature.
The formula for converting a Celsius scale to a Kelvin scale is:

K=C+273.15
 
Temperature_Scales.png
Temperature scales
Reference:
https://commons.wikimedia.org/wiki/File:Temperature_Scales.png