Page 349 - IGC BOOK

Radiation

Heat is transferred by radiation through electromagnetic waves,
where no medium is required for them to propagate. You can feel
heat transfer from a fire or the Sun. Yet the space between Earth
and the Sun is largely empty, without any possibility of heat
transfer by convection or conduction. The rate of heat transfer by
radiation is largely determined by the colour of the object. For
example, an electrical element on a stove glow from red to
orange, while the higher-temperature steel in a blast furnace
glows from yellow to white.
Fire Spread - Radiation

Direct Burning

When a burning material is in contact with other material heat is transferred causing fire to spread.
Very often direct burning is the only cause of fire spread in the early stages of fire until the heat in the
fire builds up. For e.g. poorly discarded cigarette falling on to the newspaper causing to ignite.

ENSIGN | Unit IG2 – Element 10 –Fire 4