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Glossary of Terms > A

Absolute zero

The lowest temperature ever reachable in the universe. Zero degrees Kelvin (0K) Equilavent to minus 273 degrees Celcius .

Acceleration

The rate of change of velocity, measured in metres per second.

Adaptation

An evolutionary process as a result of natural selection where a species becomes better adjusted to its environment.

Agar

A jelly like product of seaweed, used as a culture medium for microbiological work.

Allele

The genetic variant of a gene, responsible for the different traits of certain characteristics.

amp

Abbreviation of ampere, the SI unit of electrical current, equal to one coulomb per second.

Anode

The electrode or terminal by which current enters an electrolytic cell, voltaic cell, battery, etc.

Aperture

An opening that allows light to pass through.

Atom

The smallest component of an element. Atoms are composed of protons, neutrons and electrons.

Avogadro's Number (constant)

An Avogadro's number of substance is called a mole. For example, a mole of carbon-12 atoms is 12 grams. Avagadro's Number: 6.0220x1023.