# cross section

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Related to Crosssection: Scattering cross section

## cross section

1. Maths a plane surface formed by cutting across a solid, esp perpendicular to its longest axis
2. a section cut off in this way
3. Physics a measure of the probability that a collision process will result in a particular reaction. It is expressed by the effective area that one participant presents as a target for the other

## Cross Section

in hydraulics, the cross section of a liquid stream (in a pipeline, channel, or river) perpendicular to the direction of the flow velocity. If the liquid motion is continuously changing, the cross section is taken as flat and equal to the cross section area of the flow.

## cross section

[′krȯs ‚sek·shən]
(geology)
A diagram or drawing that shows the downward projection of surficial geology along a vertical plane, for example, a portion of a stream bed drawn at right angles to the mean direction of the flow of the stream.
An actual exposure or cut which reveals geological features.
(graphic arts)
A diagram or drawing representing a cut at right angles to an axis.
(mapping)
A horizontal grid system that is laid out on the ground for determining contours, quantities of earthwork, and so on, by means of elevations of the grid points.
(mathematics)
The intersection of an n-dimensional geometric figure in some euclidean space with a lower dimensional hyperplane.
A right inverse for the projection of a fiber bundle.
(physics)
An area characteristic of a collision reaction between atomic or nuclear particles or systems, such that the number of reactions which occur equals the product of the number of target particles or systems and the number of incident particles or systems which would pass through this area if their velocities were perpendicular to it. Also known as collision cross section.

## cross section

A representation of a building, or portion thereof, drawn as if it were cut vertically to show its interior; often taken at right angles to the longitudinal axis of the building.
References in periodicals archive ?
As shown in Figure 8(b), the shear force of the tunnel crosssection shows a "V" shape trend under the action of one-way loading wave (Z direction).
The crosssection of hemp fibres used in this research was found to be more polygonal than circular in shape.
IT WOULD surprise many that a band coming out of the Lower East Side of Manhattan features a crazy crosssection of nationalities, with hardly an American among them.
Mel, who has been helping organise the event for more than 15 years, added: "There were around 50 vehicles which were a good crosssection of the classic range.
It also has a crosssection showing the Grand Gallery and museum objects.
"It also reveals the UK Government's lack of ambition for Wales in its willingness to ignore the advice and ambitions of such a broad crosssection of Welsh society."
"I spoke to 5,500 children in the last year about this as a career and there were lots of ladies who said, 'I can't do that, I'm a girl.'" As well as opening up engineering to a broader crosssection of society Tim hopes to create an elite class of engineer at the college through the accredited learning programmes.
Speaking ahead of the Guinness World Records 2016 release, its editor-in-chief, Craig Glenday, said: "By providing a mix of the newest, most amazing records and a splash of the classic titles that readers know and love, the 2016 edition is a great crosssection of humanity's greatest accomplishments."
While many worship leaders can reach only certain demographics, Don can extend to and touch a crosssection of worshippers and believers from diverse social classes and religious beliefs, with many seniors and youngsters enjoying his songs.
The International Sport Business Congress, part of IFB 2014, brought together experts from a crosssection of sports, including football, basketball and rugby.
The summit is a day-long forum for individuals and companies, from a crosssection of industries to come together and share their wisdom, ideas, experiences and future aspirations.
There are scout groups, guide groups, preschools, youth clubs, football teams, disability support groups, pensioners' groups and many more, a fantastic crosssection of the community projects striving to make life better in Coventry and Warwickshire.

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