What are combustible and non-combustible substances ? Explain with examples.
The substances in which combustion takes place are called combustible substances. For example : wood, paper, coal.
The substances in which no combustion takes place are called non-combustible substances. For example : Glass, iron nail.
Why does paper burn with a yellow flame ?
Why is a match stick rubbed against a rough surface to light it ?
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 is supposed to be the cause of global warming ?
