Charcoal is a carbonaceous material formed by pyrolysis when the temperature of any organic material rises above its dry ignition temperature, but is prevented from igniting by hypoxic conditions (Orvis et al., 2005).
Nevertheless, this kind of energetic igniters has some disadvantages such as relatively low transient ignition temperature and output energy.
A relationship exists between the ignition temperature and the pressure of the mixture under specific conditions.
The reaction sets in as the mixture of combustibles attains the ignition temperature.
And with twice the ignition temperature of petrol, it is less likely to catch fire.
Higher volatile content in coal leads to lower ignition temperature.
"The egg is absorbing the heat and keeping the paper below that critical ignition temperature," he explains.
For hot surface ignition, the standard ignition temperature (Godbert Greenwald) seems to be reasonably correlated to the size and critical ignition temperature of the heating body.
That temperature is only one-ninth that of molten nuclear fuel and is less than a third of graphite's ignition temperature.
