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Ab- ab
- A prefix indicating that an electrical unit is part of the CGS absolute electromagnetic system.
- Ab Initio
- Latin meaning "from first principles".
- Abacus
- The uppermost part of a colurnn capital or pilaster, on which the architrave rests. Also, a bead frame used as an arithmetic calculating aid.
- Abampere
- The CGS electromagnetic unit of current equal to 10 Amperes.
- Abamurus
- A supporting wall or buttress, built to add strength to another wall.
- Abaxial
- Rays of light which do not coincide with the optical axis of a lens system.
- Abbe Number
- The ratio of refractivity to dispersion in an optical medium.
- Abbe Refractometer
- An instrument for measuring directly the refractive index of liquids, minerals and gemstones.
- Abcoulomb
- The CGS unit of electric charge equal to 10 Coulomb.
- Abegg′s Rule
- This states that the difference between the maximum positive and negative valence of an element is frequently eight.
- Abel Flashpoint Apparatus
- A petroleum-testing apparatus for determining the flash point.
- Abelian Group
- A mathematical group of transformations with the property that the end result of a series of transformations does not depend on the order in which they are performed.
- Abend
- A procedure to halt a computer program prematurely, ABnormal END.
- Aberration
- A defect in a mirror or lens causing light rays from a single point to fail to
focus at a single point in space.
- Abfarad
- The CGS unit of capacitance equal to 1.0x109Farad.
- Abhenry
- The CGS unit of inductance equal to 1.0x10-9Henry.
- Abhesive
- A substance which prevents two materials sticking together, e.g., teflon on frying pans.
- Ablate
- To carry away.
- Ablating Material
- A material designed to provide thermal protection to a body in a fluid stream through loss of mass.
- Abmho
- The CGS unit that is the reciprocal of the ohm equal to 1.0x109Siemens.
- Abney Level
- Hand-held instrument in which angles of steep sights are measured while simultaneously viewing a spirit-level bubble.
- Abohm
- The CGS unit of electrical resistance equal to 1.0x10-9Ohms.
- Abort
- To terminate or stop a process prematurely.
- About Us
- We are a small consultancy formed from a group of people with very different
skills in engineering, physics and software engineering.
- Abraded
- Pertaining to a surface that has been worn by surface rubbing.
- Abram′s Law
- A rule that the ratio of water to cement for chemical action to impart strength to concrete is 0.85:1.
- Abrasion
- A process where hard particles are forced against and moved along a solid surface.
- Abrasion Hardness
- Resistance to abrasive wear.
- Abrasive
- A very hard, brittle, heat-resistant substance that is used to grind the edges or rough surfaces of an object.
- Abrasive Cleaner
- A cleanser with some hard grit used to remove the grime and oils from a surface.
- Abrasive Paper
- A paper upon which sand or hard grit has been glued.
- Abrasive Wear
- A mechanism of wear due to the presence in one or both surfaces of hard particles.
- Abrasive Wheel
- A grinding wheel composed of an abrasive grit and bonding agent.
- Abscissa
- The x coordinate on an (x, y) graph.
- Absolute Accuracy
- A measure of the uncertainty of an instrument reading compared to that of a primary standard traceable to a National standard.
- Absolute Age
- The geological age of a fossil, mineral, rock or event, generally given in years.
- Absolute Ceiling
- The maximum altitude above sea level at which a heavier-than-air craft can be maintained in level flight.
- Absolute Humidity
- The total mass of water vapour present in the air per unit volume, generally given in g/m3.
- Absolute Instrument
- An instrument whose calibration can be determined by means of physical measurements on the instrument.
- Absolute Pitch
- The exact pitch value of a musical note (for example, middle C)
- Absolute Pressure
- Pressure measured from a starting point of 0 in perfect vacuum.
- Absolute Space
- Space that is not affected by what occupies it or occurs within it and that
provides a standard for distinguishing inertial systems from other frames of reference.
- Absolute Temperature
- Temperature measured on a scale that sets absolute zero as zero.
- Absolute Unit
- A unit defined in terms of fundamental quantities.
- Absolute Vacuum
- A volume which contains no matter.
- Absolute Value
- The positive value for a real number, disregarding the sign.
- Absolute Zero
- At this temperature atoms have no energy.
- Absorb
- To transform radiant energy into a different form, with a resultant rise in temperature.
- Absorbed Dose
- The amount of a chemical that enters the body of an exposed organism.
- Absorbent Ducts
- There are many different sizes and applications of absorbent ducts.
- Absorbent Material
- A material which absorbs energy from an incident sound wave.
- Absorption
- Transformation of radiant energy to a different form of energy by the interaction of matter, depending on temperature and wavelength.
- Absorption Band
- A dark band in the absorption spectrum of a substance, corresponding to a range of wavelengths for which the substance absorbs more strongly than at adjacent wavelengths.
- Absorption Coefficient
- The fraction of sound energy that is absorbed at any surface.
- Absorption Lines
- Dark lines in a spectrum that are produced when light or other electromagnetic radiation passes through a gas cloud or similar object closer to the observer.
- Absorption Spectroscopy
- A technique for determining the concentration and structure of a substance by measuring the amount of electromagnetic radiation the sample absorbs at various wavelengths.
- Absorption Spectrum
- The collection of wavelengths missing from a continuous distribution of wavelengths.
- abtesla
- The CGS unit of magnetic flux density equal to 10-4 tesla.
- Abundance Ratio
- The ratio of the number of atoms of an isotope to the number of atoms of another isotope of the same element in a sample.
- Abundant Number
- A positive integer that is smaller than the sum of its proper divisors.
- Abut
- The action of two gear teeth making contact.
- Abutment
- A part which stops the motion of another part from proceeding any farther.
- Abutting Edge
- The side or edge of a panel which joins another panel.
- Abvolt
- The CGS unit of electromotive force equal to 1.0x10-9Volt.
- abwatt
- The CGS unit of power equal to 10-7 watt.
- abweber
- The CGS unit of magnetic flux equal to 10-8 weber. Also known as the maxwell.
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