Phase changesBy: Ralph Lery U. Guerrero

IV- Mahogany

Latent Heat

is the amount of energy in the form of heat released or absorbed by a substance during a change of phase (i.e. solid, liquid, or gas), – also called a phase transition. A typical example is a change of state of matter,

meaning a phase transition such as the melting of ice or the boiling of water cry.

The heat of transformation.

Joseph Black(1728-1799)

was a Scottish physician and chemist, known for his discoveries of latent heat, specific heat, and carbon dioxide. He was professor of Medicine at University of Glasgow (where he also served as lecturer in Chemistry). 

Heat of fusion

The latent heat of fusion of a substance is the amount of heat to change a unit mass of the solid into the liquid without a change in temperature.

Heat of vaporization

The latent heat of vaporization is the amount of heat required to change a unit mass of a liquid into gas without a change in temperature.

Link to Chemistry

The energy change is endothermic when going from solid to liquid to gas, but exothermic when going in the opposite direction.

Heating Curve

Heating curves show how the temperature changes as a substance is heated up.

Cooling curves are the opposite. They show how the temperature changes as a substance is cooled down. 

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