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Colloidal suspension of a gas in a liquid.

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Moderator

A substance such as hydrogen, deuterium, oxygen or paraffin capable of slowing fast nuetrons upon collision.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Fluorescence

Absorption of high energy radiation by a substance and subsequent emission of visible light.

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Free Energy Change

The indicator of spontaneity of a process at constnt T and P. If delta-G is negative, the process is spontaneous.

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Osmotic Pressure

The hydrostatic pressure produced on the surface of a semipermable membrane by osmosis.

Salinometer

An instrument for measuring the amount of salt in a solution. Also,"salimeter, salometer."

Alkynes

Unsaturated hydrocarbons that contain one or more carbon-carbon triple bonds.

Supersaturated Solution

A solution that contains a higher than saturation concentration of solute, slight disturbance or seeding causes crystallization of excess solute.