Pyrophoricity
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A substance is pyrophoric if it ignites spontaneously in air at or below 54 °C or within five minutes after coming into contact with air. Examples are organolithium compounds and triethylborane, as we
Plutonium pyrophoricity (spontaneously burning in contact with air, causes it to glow like an ember).
White phosphorus
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White phosphorus, yellow phosphorus, or simply tetraphosphorus is an allotrope of phosphorus. It is a translucent waxy solid that quickly yellows in light, for this reason, impure white phosphorus is
Pyrophoricity
…in the air for brief periods of time, but the containers must be flushed with inert gas before the material is returned to the container for storage. White phosphorus Alkali metals, especially potassium, rubidium, caesium, including the alloy NaK…
Weißer Phosphor