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A colorless, crystalline pentose sugar, C5H10O5, derived from xylan, straw, corncobs, etc., by treating with heated dilute sulfuric acid, and dehydrating to furfural if stronger acid is used.

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Critical Pressure

The pressure required to liquefy a gas (vapor) at its critical temperature.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

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Pair of electrons involved in a covalent bond.

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The amount of heat required to raise the temperature of a body (of any mass) one degree Celsius.

Periodic Table

An arrangement of elements in order of increasing atomic numbers that also emphasizes periodicity.