Here's a breakdown:
* Pyro: From the Greek word "pyr" meaning "fire."
* Phoric: From the Greek word "pherein" meaning "to bear" or "to carry."
Essentially, a pyrophoric substance "carries fire" within itself, meaning it has a strong tendency to ignite upon exposure to air.
Examples of pyrophoric materials:
* White phosphorus: Highly reactive and ignites spontaneously in air.
* Finely divided metals: Some metals like iron, nickel, and titanium can become pyrophoric in finely divided form.
* Alkyl lithiums: A class of organometallic compounds that are highly reactive and can ignite in air.
* Triethylaluminum: A flammable and pyrophoric liquid.
Important Considerations:
* Safety: Pyrophoric materials require special handling and storage procedures due to their inherent flammability.
* Applications: Despite their danger, they are used in various applications like:
* Chemical synthesis: Used as catalysts and reagents in chemical reactions.
* Aerospace: Used in rocket propellants and fuel additives.
In essence, pyrophoric substances are incredibly reactive and pose a significant fire hazard. Always exercise extreme caution and follow strict safety protocols when handling them.