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    • 2 years ago

    For what is a parabolic trough used?

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    1. denisalex
      • 2 years ago
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      http://en.wikipedia.org/wiki/Parabolic_trough A parabolic trough is a type of solar thermal energy collector. It is constructed as a long parabolic mirror (usually coated silver or polished aluminum) with a Dewar tube running its length at the focal point. Sunlight is reflected by the mirror and concentrated on the Dewar tube. A vacuum flask (also known as a Dewar flask, Dewar bottle or Thermos) is an insulating storage vessel which keeps its contents hotter or cooler than its surroundings.

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