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Question

For Any Substance Why Does The Temperature Remain Constant During The Change Of State

Solution
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When a substance changes its state, such as from a solid to a liquid or from a liquid to a gas, the temperature remains constant during the change of state. This is because the energy being added to the substance is being used to break the intermolecular forces between the particles of the substance, rather than increasing the temperature of the substance.

The intermolecular forces between the particles of a substance determine the state of matter of the substance. In a solid, the particles are tightly packed together, and the intermolecular forces are strong. When heat is added to a solid, the particles begin to vibrate more rapidly, and the intermolecular forces weaken. At the melting point, the intermolecular forces are broken, and the solid becomes a liquid. During this process, the temperature remains constant because the energy being added is being used to break the intermolecular forces between the particles, rather than increasing the temperature of the substance.

Similarly, when a liquid is heated, the particles gain energy and move more rapidly, causing the intermolecular forces to weaken. At the boiling point, the intermolecular forces are broken, and the liquid becomes a gas. During this process, the temperature remains constant because the energy being added is being used to break the intermolecular forces between the particles, rather than increasing the temperature of the substance.

In summary, the temperature remains constant during the change of state of a substance because the energy being added is being used to break the intermolecular forces between the particles of the substance, rather than increasing the temperature of the substance.

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