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pyrophoric

pyrophoric

1 9.9
Likely to catch fire by itself when it meets air, even at room temperature
  • adjective
  • /ˌpaɪrəˈfɔrɪk/
  • Specialized
translation icon : pirofórico
  • Pyrophoric explosions scattered plutonium oxide throughout the building, and cleanup was even needed outside, on the roof, in minus 30 degrees C weather.

Examples

  • The lithium deuteride is pyrophoric—it ignites spontaneously if exposed to air—so it requires special care.

  • Before we left Earth, some alarmists considered the lunar dust very dangerous; in fact, pyrophoric—capable of igniting spontaneously in air.

  • A pyrophoric solid means a solid which, even in small quantities, is liable to ignite within five minutes after coming into contact with air.

Antonyms

1 4.1

Does not catch fire or burn easily

Compounds

pyrophoric alloy
  • Specialized
9.9

A metal mix that makes sparks when you strike it, used in lighters

How Easily Ignited

pyrophoric
  • Specialized
1 9.9
flammable
41 2.8
ignitible
  • Specialized
8.0

Surface Forms

pyrophoric positive

Morphology

pyrophoric = pyro + phor + ic

The word is technically compositional, but it relies on Greek combining forms and a specialized chemistry meaning that is not readily inferable for an average learner.

Etymology

Pyrophoric comes from Greek parts pyro- meaning 'fire' and -phoric meaning 'carrying', as in pyrotechnics where pyro- is 'fire'. So if something is pyrophoric it is like a 'fire-carrier' and can catch fire by itself when it meets air.