Ignition sources

Question 1

radiation/ light

Answer 1

fuel absorbs more heat than can dissipate
radiant heat from a fire can also induce another fire

Question 2

electricity - sparks and arks

Answer 2

a localised method that only ignites gases/ vapours

spark = short
ark = maintained

Question 3

overheating

Answer 3

currents generate heat when they meet resistance
heat build up can cause ignition

Question 4

friction lighters

Answer 4

striking flint causes hot shavings and ignites vapours

Question 5

chemical reactions

Answer 5

some substances have spontaneous combustion - can mimic arson attacks

Question 6

Gas appliances

Answer 6

excessive gas not enough, only caused by an explosion
lanterns/ bonfire pieces can be carried through the air to secondary locations

Question 7

smoking

Answer 7

most commonly due to the discarded match
furniture: synthetic fibres less vulnerable than natural ones (ignition time still variable)