# aspect ratio

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## aspect ratio

[′a‚spekt ‚rā·shō]
(aerospace engineering)
The ratio of the square of the span of an airfoil to the total airfoil area, or the ratio of its span to its mean chord.
(design engineering)
The ratio of frame width to frame height in television; it is 4:3 in the United States and Britain.
In any rectangular configuration (such as the cross section of a rectangular duct), the ratio of the longer dimension to the shorter.
(mechanical engineering)
In an automotive vehicle, the ratio of the height of a tire to its width. Also known as tire profile.
(nucleonics)
The ratio of the plasma diameter of a toroidal controlled fusion device to the major diameter of the torus.

## Aspect ratio

In any rectangular configuration, the ratio between the longer dimension and the shorter dimension.

## aspect ratio

1. In any rectangular configuration (such as the cross section of a rectangular duct), the ratio of the longer dimension to the shorter.
2. In a rectangular configuration, the ratio of the long-side to the short-side.

## aspect ratio

The ratio of span of the wing to its chord. It also may be expressed as the ratio of the square of the span of the wing to its area. Aspect ratio (A) = span2/wing area, span/chord, span × chord/chord2, or wing area/chord2.

## aspect ratio

(graphics)
The ratio of width to height of a pixel, image, or display screen. Square pixels (1:1) are considered preferable but displays are usually about 5:4.

## aspect ratio

The ratio of width to height of an object. Stating the relationship of one side to the other, it is widely used to describe the shape of a TV or computer screen. For example, the aspect ratio of a standard-definition (SD) screen is 4:3, which is a relatively square rectangle. The 4:3 means "4 to 3," or four units wide to three units high. High-definition TV (HDTV) has a 16:9 ratio, which is a wide rectangle that is still not as wide as most movie theater (cinema) screens.

Another way of expressing the 4:3 and 16:9 ratios is 1.33:1 and 1.78:1, but these latter designations are used mostly for cinema formats, rather than TV (see below).

Standard or Wide Screen?
The common measurement of a computer monitor or TV is the screen's diagonal measurement in inches. However, a 20" screen does not disclose whether its layout is the older 4:3 (square) or 16:9 (wide). See letterbox, screen resolution, HDTV display modes and anamorphic DVD.

Standard and HDTV Aspect Ratios Fitting wide screen HDTV image (16:9) on the right into a standard-definition SDTV (4:3) on the left creates the "letterbox effect" (black bars on top and bottom). (Image courtesy of Intergraph Computer Systems.)

Standard and HDTV Aspect Ratios Fitting wide screen HDTV image (16:9) on the right into a standard-definition SDTV (4:3) on the left creates the "letterbox effect" (black bars on top and bottom). (Image courtesy of Intergraph Computer Systems.)
References in periodicals archive ?
With iResizer you can finally stop worrying about an aspect ratio, and start enjoying the process
While examining the air change rate ACH with various aspect ratios, it is found that the increase in air change rate was much significant in large aspect ratio, which means narrower streets.
Featuring native 16:9 aspect ratio and true 720p resolution the TransVision(TM) TV2 is a combination of two complementary components - a projector featuring DLP(TM) technology and a video controller.
Using appropriate pastes and this more sophisticated approach to stencil design, improved aspect ratios were achieved, as line widths were decreased to 50 [micro]m and conductor uniformity was significantly better than anything realized using mesh screens.
It becomes more evident why the handle aspect ratio is important--if the handle is very "wide" a large blow-up ratio will result.
Since then, due to ever-increasing vehicle handling requirements and the existence of trends to high performance tires, passenger car tire aspect ratios have been decreased.
Data from the first 18 months show a highly significant difference in aspect ratios between patients with unruptured aneurysms (1.
However, pigments with high aspect ratios and narrow particle size distributions (PSD) can contribute to increased high-shear viscosity and undesirable shear-thickening rheology in slurries and coating colors.
While it supports resolutions from 640 x 350 up to 1280 x 1024 and 4:3 or 16:9 aspect ratios, it's also compatible with NTSC, PAL, SECAM and NTSC 4.
First, the same thing happens when you have a film negative enlarged to a 5-by-7 or 8-by-10 print, both of which have different aspect ratios than that 3:2 film negative.
At technology nodes of 65 nanometers and below, it becomes increasingly difficult for high-density plasma chemical vapor deposition (HDPCVD) films to produce void-free gap fill, due to the narrower features and high aspect ratios at those nodes.

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