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Metric As a lower-case prefix a-, see atto-.

length. Metric Correctly Å, see angstrom.

area. As a, see are; see ...

Metric As symbol see A, a.

sub-atomic physics. See atomic unit.

[annum]

time. Anomalistic year; see anomalistic and year.

time. Astronomical year.

A prefix attached to the name of a practical electrical unit to provide a name for a unit in the electromagnetic system of units (...

[absolute ampere]

(biot) electric current. Symbol abA. Metric-c.g.s.-e.m.u 1 abA = the constant current that produces, when maintained in two parallel conductors of negligible circular section and of infinite length placed 1 centimetre apart, a force of 2 dynes per centimetre between the two conductors. 1 abA = 10 A....

electric charge. Symbol abC. Metric-c.g.s. The absolute coulomb of the e.m.u. system, for a steady current identically s⋅abA. 1 abC = 10 C....

electric elastance. Symbol abD. Metric-c.g.s. The absolute daraf of the e.m.u. system, for a steady current identically abV/abC, and identically reciprocal abfarard. 1 abD = 1 abF...

1. (in optics) A defect in the image formed by a lens or curved mirror. In chromatic aberration the image formed by a lens (but not a mirror) has coloured fringes as a result of the different extent to which light of different colours is refracted by glass. It is corrected by using an ...

electric capacitance. Symbol abF. Metric-c.g.s. The absolute farad of the e.m.u. system, for a steady current identically abC/abV, and identically reciprocal abdaraf. 1 abF = 1 GF....

electromagnetic inductance. Symbol abH. Metric-c.g.s. The absolute henry of the e.m.u. system, for a steady current identically abV/abA/second. 1 abH = 1 nH....

electric conductance. Metric-c.g.s. The absolute mho of the e.m.u. system, for a steady current identically abA/abV, and identically reciprocal abΩ. 1 abmho = 1 GS....

electric resistance. Symbol abΩ. Metric-c.g.s. The absolute ohm of the e.m.u. system, for a steady current identically abV/abA, and identically reciprocal abmho. 1 abΩ = 1 nΩ....

Within metrology generally, the qualifier ‘absolute’ indicates using mass rather than weight, i.e. force, as a basic dimension; hence an absolute system contrasts with a ...

1. Not dependent on or relative to anything else, e.g. *absolute zero.

2. Denoting a temperature measured on an ...

temperature. See kelvin scale.

astronomy. Symbol M. See stellar magnitude.

The ability of a person to identify and reproduce a note without reference to a tuned musical instrument.

electromagnetics. Metric See absolute system and practical units.