Melting

Definition

Melting is the phase transition from a solid to a liquid. It occurs when a substance absorbs enough heat to overcome its molecular bonds.

5 Must Know Facts For Your Next Test

1. The temperature at which melting occurs is known as the melting point.
2. During melting, the temperature of the substance remains constant until all the solid has transitioned to liquid.
3. Melting involves an increase in entropy because molecules move from a more ordered state (solid) to a less ordered state (liquid).
4. The heat energy required for melting is called the latent heat of fusion.
5. Pressure can affect the melting point; for example, ice melts at lower temperatures under higher pressures.

Review Questions

• What happens to the temperature of a substance during its melting phase?
• Explain the role of latent heat in the process of melting.
• How does pressure influence the melting point of a substance?

Related terms

Freezing: The phase transition from a liquid to a solid, occurring when a substance loses heat.

Latent Heat:

The amount of heat absorbed or released during a phase change without changing temperature.

Phase Transition: A change in the state of matter (solid, liquid, gas) involving energy exchange.