Why is a match stick rubbed against a rough surface to light it ?
On rubbing the match stick in the rough surface, the friction converts this work into heat. The heat raises the temperature of the chemical present on the match stick head to its ignition temperature. Due to this the chemical substance catches fire and the match stick starts burning.
What is supposed to be the cause of global warming ?
Why does paper burn with a yellow flame ?
Goldsmiths blow the outermost zone of a flame with a metallic blow pipe for melting gold and silver. Why do they use the outermost zone of the flame ?
What are combustible and non-combustible substances ? Explain with examples.
