For any substance, why does the temperature remain constant during the change of state?
Hint: The heat supplied to a system is used to break its intermolecular force of attraction.
Explanation:
- The kinetic energy of particles in a substance is directly proportional to the temperature.
The relation is shown as;
$$K.E = \dfrac {3} {2}kT$$
Where $$K.E$$ = Kinetic energy
$$k$$ = Energy constant
$$T$$ = Temperature
- As temperature increases the kinetic energy of particles also increases but in case of a change of state, the energy supplied to the substance by increasing temperature is used to break the intermolecular forces between the particles so that the state can be changed.
- Hence, the temperature remains constant as all the heat is used up and no external heat is released or absorbed.