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At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.

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yttrium

A rare trivalent metallic element, found in gadolinite and other minerals. Symbol: Y, at. wt.: 88.905, at. no.: 39, sp. gr.: 4.47. Cf."rare-earth element."

Yttrium has a silver-metallic luster and is relatively stable in air unless finely divided. Turnings of the metal, however, ignite in air if their temperature exceeds 400oC. Yttrium oxide is one of the most important compounds of yttrium and accounts for the largest use. It is widely used in making YVO4 europium, and Y2O3 europium phosphors to give the red color in color television tubes.

Hydrate

A solid compound that contains a definite percentage of bound water.

Ore

A natural deposit containing a mineral of an element to be extracted.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

ytterbia

Ytterbia is a colorless compound, Yb2O3, used in certain alloys and ceramics. Also known as ytterbium oxide.

Second Law of Thermodynamics

The universe tends toward a state of greater diorder in spontaneous processes.

Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Heat

A form of energy that flows between two samples of matter because of their differences in temperature.

Ligand

A Lewis base in a coordination compound.

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.