Substances can exist in three states of matter - solid, liquid and gas. Substances can change states. To change the state of a substance energy must be transferred to, or from, the substance. Phew! On ...

Renewable energy sources are becoming increasingly popular. However, such energy can be wasted if an excess is available when it’s not yet needed. A particularly relevant example is solar power; solar ...

Specific latent heat is the amount of energy required to change the state of 1 kilogram (kg) of a material without changing its temperature. As there are two boundaries, solid/liquid and liquid/gas, ...