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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
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 results are consistent with the predictions of continuum elasticity theory for the strain of a point source subject to an applied force.
It sounds as if you're telling us to give up because we're talking about cumulative impacts and you can't find a point source of pollution.
Generally speaking, point source pollution is easier to regulate or control because you know the source of the pollution.
It uses a point source of monochromatic light at the focus of a quality lens.
Young placed a screen with two pin holes in it in front of a point source of light.

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