What does the the term firing means?

Answer 1

"Fire triangle" refers to the three elements that must be present for a fire, namely,

1. fuel,
2. heat, and
3. oxygen.

This simple model illustrates that fire can be "broken" (i.e., extinguished) or prevented if any of the three components is removed.

A slightly more sophisticated model, known as the "fire tetrahedron", also contains the element of "chemical reaction", without which fuel, heat and oxygen cannot combine to make fire. In other words, if the chemical reaction is removed, the fire tetrahedron "collapses" and the fire is extinguished or prevented.
"Fire triangle" refers to the physical elements that must be present for a fire, namely,

1. fuel,
2. heat, and
3. oxygen.

This simple model illustrates that fire can be "broken" (i.e., extinguished) or prevented if any of the three components is removed.

A slightly more sophisticated model, known as the "fire tetrahedron", also contains the element of "chemical reaction", without which fuel, heat and oxygen cannot combine to make fire. In other words, if the chemical reaction is removed, the fire tetrahedron "collapses" and the fire is extinguished or prevented.