Question

Define absolute zero and absolute scale of temperature. Write the relationship between ${}^{\circ }C$ and K.

Answer 1

Absolute zero is the lower limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reaches its minimum value, taken as $0$.

The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

Relation between ${}^{o}C$ and $K$ is:

${[}^{o}C]=[K]-273.15$