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 It might be outdated or ideologically biased.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 ?
'We understand the size and power restrictions for "targeted" module form factors,' Tracy said.
Chip-on-board (COB) form factors put LED chips directly on the PCB, eliminating the second substrate that comes when using SMT with the benefit of a much lower thermal path.
TYAN's embedded server platforms are designed to meet high reliability and safety requirements, and offer support for industry standard form factors. These platforms conform to higher standards and are ideal for a wide range of industrial controls, networking, surveillance, medical instrument, digital imaging and printing applications.
In this study, 3-point sum rules (3PSR) method is used to calculate the strong form factors and coupling constants of the [D.sup.*.sub.s][D.sup.*] [K.sup.*] and [D.sub.s1][D.sub.1][K.sup.*] vertices.
The Benoit approach [1] is used here to calculate the scattering form factor for a flexible star-branched polymer represented in Fig.
"Small form factor systems are becoming more popular nowadays with the advent of low power systems and slick designs; however, small form factor systems are limited in terms of expansion capabilities and typically require low-profile expansion cards.
"Seagate's Savvio enterprise-class 2.5-inch small form factor disc drive is the result of extensive research with HP and other leaders interested in solving end-user IT challenges to improve IOPS performance, consolidate space, and reduce power consumption," said Sherman Black, Seagate Senior Vice President and General Manager of Enterprise Storage.
"This new desktop system empowers customers to better manage and support their technology investment through the utilization of Intel's AMT hardware, LANDesk's management technologies, and the new BTX form factor," said Paul Petersen, MPC's vice president of product marketing and development.
Brian Lucas, spokesman at Best Buy, said the "form factor, brightness and picture quality are [also] driving sales."
The addition of the Transmit Disable Function to the Multimode 2x5 Small Form Factor (SFF) transceivers enables drop-in replacement to the existing 2x5 SFF Single Mode Transceiver footprints, offering instant upgrade capability for Multimode applications.
* The biggest market driver for the NetTV is that television technology is very pervasive and familiar, and the TV is a friendly form factor. TVs will not have to win consumer mindshare in the same way as new form factors do.
The Disk Products Division of Toshiba America Electronic Components (TAEC) has announced the industry's fastest CD-ROM drive in the slim 12.7mm form factor. Named the XM-7102, the drive delivers advanced transfer rates of up to 32x.