For any substance, why does temperature remain constant during change of state?

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For any substance, why does temperature remain constant during change of state?

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Answer 1 · 2017-06-28T05:05:53

Because a condition of $phase equilibrium$ $"phase equilibrium"$ applies during change of state.

Explanation:

For the thermodynamic processes......

$H_{2} O (s) ⇌ H_{2} O (l)$ $H_2O(s)rightleftharpoonsH_2O(l)$ at $0$ $0$ $^{\circ} C$ $""^@C$ and....

$H_{2} O (l) ⇌ H_{2} O (g)$ $H_2O(l)rightleftharpoonsH_2O(g)$ at $100$ $100$ $^{\circ} C$ $""^@C$ .....

.........these occur under equilibrium conditions. Energy has to be supplied to break the (strong) bonds between the molecules of the condensed phase; for water, this so-called $latent heat of fusion$ $"latent heat of fusion"$ or $latent heat of vaporization$ $"latent heat of vaporization"$ are quite large and reflects the degree of INTERMOLECULAR force between the individual molecules (i.e. a consequence of hydrogen bonding).

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For any substance, why does temperature remain constant during change of state?

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