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What does pyrophoric mean?

Looking for the meaning or definition of the word pyrophoric? Here's what it means.

Adjective
  1. spontaneously igniting in air, especially when in a finely divided state
  2. producing sparks, especially by friction
  3. (fire investigation) Able to oxidize with exposure to atmospheric oxygen at normal temperatures.
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Examples
Dr. Edward Ough: If I can say one thing here, the other thing to note is the fact that depleted uranium, or uranium metal, is pyrophoric.
In addition to the radioactivity, DU is chemically toxic, pyrophoric and usually spreads aerolisized particles over a large area on impact.
Uranium reacts with both air and water, and may form a pyrophoric surface when stored in the presence of moist air.
It's pyrophoric, meaning that it can spontaneously combust with a little bit of oxygen and some heat.
One of the oldest uses for praseodymium is in the manufacture of misch metal, a pyrophoric metal used to make lighter flints and tracer bullets.
It is pyrophoric, burning spontaneously on impact, and extremely dense.

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