Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Sublimation has also been used as a generic term to describe a solid-to-gas transition (sublimation) followed by a gas-to-solid transition (deposition).

Examples of Sublimation:

1. "Dry ice" (or solid carbon dioxide) and iodine sublime.
2. Mothballs sublime.
3. Snow and ice can sublime in the winter months without melting.
4. Frozen foods will sublime and you will find ice crystals inside of the box or bag.

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• Density is a measure of mass per unit of volume.

• An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).