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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
Aside from being very dense and pyrophoric, depleted uranium shells also have a nasty tendency to vaporise.
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.
Silane is an extremely hazardous pyrophoric gas that has caused operator fatalities in solar cell manufacturing.
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.
Misch metal, which contains a high proportion of cerium, is used to manufacture pyrophoric alloys.

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