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An impure form of carbon obtained by destructive distillation of coal or petroleum.

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Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Nuclide Symbol

Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

Critical Mass

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

Extensive Property

A property that depends upon the amount of material in a sample.

Polyene

A compound that contains more than one double bond per molecule.

Salicylate

A salt or ester of salicylic acid.

Flotation

Method by which hydrophobic (water-repelling) particles of an ore are separated from hydrophilic (water-attracting) particles of a metallurgical pretreatment process.

Allotropic Modifications (Allotropes)

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

Emulsion

Colloidal suspension of a liquid in a liquid.

Distillation

The separation of a liquid mixture into its components on the basis of differences in boiling points. The process in which components of a mixture are separated by boiling away the more volitile liquid.