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Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

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Condensation

Liquefaction of vapor.

Joule

A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.

Hydrometer

A device used to measure the densities of liquids and solutions.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Mass Deficiency

The amount of matter that would be converted into energy if an atom were formed from constituent particles.

Transition State Theory

Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

Entropy

A thermodynamic state or property that measures the degree of disorder or randomness of a system.

Molecular Formula

Formula that indicates the actual number of atoms present in a molecule of a molecular substance.

Gamma Ray

High energy electromagnetic radiation. A highly penetrating type of nuclear radiation similar to x-ray radiation, except that it comes from within the nucleus of an atom and has a higher energy. Energywise, very similar to cosmic ray except that cosmic rays originate from outer space.

Moderator

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