form factor

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form factor

[′fȯrm ‚fak·tər]
The ratio of the effective value of a periodic function, such as an alternating current, to its average absolute value.
A factor that takes the shape of a coil into account when computing its inductance. Also known as shape factor.
The theoretical stress concentration factor for a given shape, for a perfectly elastic material.
A function which describes the internal structure of a particle, allowing calculations to be made even though the structure is unknown.
(quantum mechanics)
An expression used in studying the scattering of electrons or radiation from atoms, nuclei, or elementary particles, which gives the deviation from point particle scattering due to the distribution of charge and current in the target.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Form Factor


a function that characterizes the distribution of the electric charge or magnetic moment within some microsystem, such as an atom or atomic nucleus, or within an elementary particle. The form factor of an atom is determined by the distribution of atomic electrons; the form factor of a nucleus is determined primarily by the distribution of nucleons (protons and neutrons) within the nucleus. In the latter case, virtual mesons also contribute to the form factor; they are the basis for the nucleon exchange that gives rise to nuclear forces. The existence of a form factor has also been established for strongly interacting elementary particles—hadrons, such as nucleons and pions. Experiments on the elastic scattering of high-energy electrons and muons by hadrons lead to the conclusion that the size of the region over which the electric charges and magnetic moments of the hadrons are distributed is of the order of 10–13 cm. These data directly attest to the complex structure of hadrons. At the same time, experiments indicate that the maximum range at which the charge of an electron or muon is appreciable does not exceed 10–15cm.

The form factor of hadrons that characterizes the dimensions of hadrons in processes involving the weak interaction is postulated by analogy with form factors characterizing the distribution of magnetic moment.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

form factor

The type of packaging of a processor integrated circuit, e.g. PPGA, FC-PGA.

More generally, a term popular among marketroids in 1998, denoting the shape of something designed.
This article is provided by FOLDOC - Free Online Dictionary of Computing (

form factor

The physical size of a device as measured by outside dimensions. With regard to a disk drive, the form factor is the diameter of the platters, such as 2.5", 3.5" and 5.25", not size in terms of storage capacity. See footprint.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
'While form-factor agnostic, OIF tries to look at the ecosystem and ensure all the aspects are ready for deployment,' said Maki.
Pictos' small form-factor and low-power imaging solution enhances the consumer experience by enabling users to take digital photos and video on their wireless phones, and send them to friends and family from any location at any time.
A NEW FORM-FACTOR FOR SCHOOL One question not discussed enough is how tablets will influence school.
Finisar Corporation (Nasdaq:FNSR) has launched its first Small Form-Factor Pluggable (SFP) Optical Transceivers.
The LF-3004 built-in drive, which may be mounted horizontally or vertically, is contained entirely within the standard form-factor dimensions of 4.06 inches (W) x 1.7 inches (H) x 5.8 inches (D).
Epiq Solutions' Sidekiq SDR cards provide breakthrough small form-factor wideband RF transceivers for integration into portable systems that require flexible tuning ranges (70 MHz to 6 GHz) and on board processing and programmable logic.
Opnext Inc (Nasdaq: OPXT), a provider of laser technology, announced on Friday (14 September) the availability of another form-factor of the company's 10G LRM optical pluggable module family.
Two of the four units are based on the mid-size (4 hp) form-factor that was recently introduced by the PICMG.
As users demand new, more robust applications, designers and manufacturers must revamp their existing products, focusing on performance, power management, capacity, acoustics and smaller form-factor. Hard-drive designers have responded with a move in recent years from one to three available spindle speeds, from one to two available form factors, and with an increased focus on higher available notebook hard-drive capacities and additional onboard cache, further diversifying the hard drives now available for the notebook market.
Stratos produced the industry's first Multimode LED and VCSEL-based LC transceivers for Fast Ethernet, Gigabit Ethernet and Fibre Channel applications, and one of the first to offer 1Gbps 1x9-pin SC VCSEL transceivers, 2xFibre Channel Small Form Factor (SFF) transceivers and Small Form-factor Pluggable (SFP) transceivers.