Question

What does the melting point of a solid indicate?

Answer 1

Hint: Melting point of substance is temperature at which it melts or the temperature at which solid is converted into liquid.
Example: Melting point of ice is ${0^\circ }C$ it means at ${0^\circ }C$ ice converted into water.

Complete answer:
As we know at melting point substance changes state from solid to liquid.
$solid\overset {m.p.} \leftrightarrows liquid$
At melting point, the solid and liquid phase exist in equilibrium.
The melting point of a substance depends on pressure and temperature.
During the melting process the temperature of substance does not change. For example when ice melts to water the temperature of the system remains ${0^\circ }C$ throughout the change.
Melting point of some substances are

Copper	1359K
Aluminum	932K
Hydrogen	13.8K
Mercury	234K

Melting point of compound determined by the force of attraction between molecules. If intermolecular attraction is greater than it results in higher melting point. Ionic compounds usually have a high melting point because the electrostatic force of attraction between them is very strong.

Note: The term ‘Freezing point’ is opposite of the term melting point.
It is used to denote the temperature at which a liquid is converted into solid.
Substances can be cooled below freezing points formation of solid. Such liquids are known as supercooled liquid.