## A Quick reference

### A Dictionary of Weights, Measures, and Units

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

length. *Metric* Correctly Å, see angstrom.

area

##
a_{anom}
Quick reference

### A Dictionary of Weights, Measures, and Units

[annum]

time. Anomalistic year; see anomalistic and year.

## ab- Quick reference

### A Dictionary of Physics (7 ed.)

A prefix attached to the name of a practical electrical unit to provide a name for a unit in the

## abampere Quick reference

### A Dictionary of Weights, Measures, and Units

[absolute ampere]

(biot) electric current. Symbol abA. *Metric-c.g.s.-e.m.u* 1 abA = the constant current that produces, when

## abcoulomb Quick reference

### A Dictionary of Weights, Measures, and Units

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

## abdaraf Quick reference

### A Dictionary of Weights, Measures, and Units

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

## aberration Quick reference

### A Dictionary of Physics (7 ed.)

1. (in optics) A defect in the image formed by a lens or curved mirror. In chromatic aberration the image

## abfarad Quick reference

### A Dictionary of Weights, Measures, and Units

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

## abhenry Quick reference

### A Dictionary of Weights, Measures, and Units

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.

## abmho Quick reference

### A Dictionary of Weights, Measures, and Units

electric conductance. *Metric-c.g.s.* The absolute mho of the e.m.u. system, for a steady current identically abA/abV, and identically

## abohm Quick reference

### A Dictionary of Weights, Measures, and Units

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

## absolute Quick reference

### A Dictionary of Weights, Measures, and Units

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

## absolute Quick reference

### A Dictionary of Physics (7 ed.)

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

2. Denoting a temperature measured on

## absolute centesimal thermodynamic scale Quick reference

### A Dictionary of Weights, Measures, and Units

temperature. See kelvin scale.

## absolute magnitude Quick reference

### A Dictionary of Weights, Measures, and Units

astronomy. Symbol M. See stellar magnitude.

## absolute pitch Quick reference

### A Dictionary of Physics (7 ed.)

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

## absolute practical system Quick reference

### A Dictionary of Weights, Measures, and Units

electromagnetics. *Metric* See absolute system and practical units.

## absolute space Quick reference

### A Dictionary of Physics (7 ed.)

Space that exists as a background to events and processes and is not affected by objects or other entities in