What type of fuels : (a) burn with a flame? (b) burn without a flame?
(a) Gaseous fuels like cooking gas (LPG) burn with a flame. (b) Solid and liquid fuels (coal, charcoal, etc.) burn without a flame.
(a) What is a flame? What type of substances, on burning, give a flame?
(b) What is the difference between the burning of a candle and the burning of a fuel like coal ?
What type of substance burns with a flame ? Can the answer be metals ??