Question

Does melting point increase with pressure?

Answer 1

1. The melting point is that temperature at which a solid is converted into a liquid. The effect of pressure of the melting point of a solid depends on whether it is expanding or contracting on melting.
2. In case of majority of solids, the melting point increases with increase in pressure as the solid itself is usually more dense than the liquid. When we apply high pressure to it, the pressure helps it to overcome the intermolecular forces of attraction. As it melts, it expands and becomes less dense.
3. In the case of ice, the melting point decreases with increase in pressure. As the temperature is increased, it contracts and forms water. With an increase in pressure, the ice melts readily and hence the melting point is reduced.
4. Hence, the melting point increases with increase in pressure in majority of solids. Exceptions include ice.