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What is a point source?

What is a point source? Here are some definitions.

Noun
  1. (sciences) a source of pollution, radiation, waves, fluid or other substance that has one specific location (and negligible physical extent, distinguishing a point source from other source geometries). In simulations they can often be approximated using mathematical point sources.
  2. (mathematics) the abstract concept of a singularity emitting a flux or flow. A source with infinitesimal dimensions in space.
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Examples
The simulation showed that under still and convective conditions the vapours emitted by a point source rapidly form stationary envelopes around the leaves.
He said regional council staff had concluded that the discharges would be a very high point source for several potentially toxic metals and dioxins.
The light used must come from a point source, the smaller and the more intense it is the better.
Generally speaking, point source pollution is easier to regulate or control because you know the source of the pollution.
In other words, for a light meter to read 1 foot-candle from a uniform point source of light that is 1 ft. away, a light source of about 12.57 lumens is required.
Illuminance is the measurement of how bright a point source of light appears to the eye.

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