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ampere-hour

Overview page. Subjects: Chemistry — Physics.

A practical unit of electric charge equal to the charge flowing in one hour through a conductor passing one ampere. It is equal to 3600 coulombs.

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ampere-turn

Overview page. Subjects: Chemistry — Physics.

The SI unit of magnetomotive force equal to the magnetomotive force produced when a current of one ampere flows through one turn of a magnetizing coil.

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anharmonic oscillator

Overview page. Subjects: Physics — Chemistry.

An oscillating system (in either classical mechanics or quantum mechanics) that is not oscillating in simple harmonic motion. In general, the problem of an anharmonic oscillator is not...

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antiparallel spins

Overview page. Subjects: Chemistry — Physics.

Neighbouring spinning electrons in which the spins, and hence the magnetic moments, of the electrons are aligned in the opposite direction. Under some circumstances the interactions between...

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atmolysis

Overview page. Subjects: Chemistry — Physics.

The separation of a mixture of gases by means of their different rates of diffusion. Usually, separation is effected by allowing the gases to diffuse through the walls of a porous partition...

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atmosphere

Overview page. Subjects: Chemistry — Physics.

1 (atm.) A unit of pressure equal to 101 325 pascals. This is equal to 760.0 mmHg. The actual atmospheric pressure fluctuates around this value. The unit is usually used for...

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atomic volume

Overview page. Subjects: Chemistry — Physics.

The relative atomic mass of an element divided by its density.

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attenuated total reflectance spectroscopy

Overview page. Subjects: Chemistry — Physics.

(ATRS)

A variation of infrared spectroscopy in which the IR source is reflected from the sample and absorption occurs only in the surface layer. ATRS is used in the analysis of...

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attractor

Overview page. Subjects: Chemistry — Physics.

The set of points in phase space to which the representative point of a dissipative system (i.e. one with internal friction) tends as the system evolves. The attractor can be: a single...

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Babbit metal

Overview page. Subjects: Chemistry — Physics.

Any of a group of related alloys used for making bearings. They consist of tin containing antimony (about 10%) and copper (1–2%), and often lead. The original alloy was invented in 1839 by...

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