n.
Ignition of a substance, such as oily rags or hay, caused by a localized heat-increasing reaction between the oxidant and the fuel and not involving addition of heat from an outside source.
A Photo a day (361 of 365)
n.
Ignition of a substance, such as oily rags or hay, caused by a localized heat-increasing reaction between the oxidant and the fuel and not involving addition of heat from an outside source.