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The minimum mass of a particular fissionable nuclide in a given volume required to sustain a nuclear chain reaction.

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Osmosis

The process by which solvent molecules pass through a semipermable membrane from a dilute solution into a more concentrated solution.

 

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

Heteronuclear

Consisting of different elements.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Ferromagnetism

The ability of a substance to become permanently magnetized by exposure to an external magnetic field.

Fat

Solid triester of glycerol and (mostly) saturated fatty acids.

Ternary Compound

A compound consisting of three elements, may be ionic or covalent.

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

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