(i) What do you mean by combustion?
(ii) What name is given to the substances which can burn easily?
(i) Combustion is the process of burning of substances to give heat and light.
(ii) Combustible substances.
Question 3:
(i) What do you mean by temperature.
(ii) Name the device used in measuring the temperature.
What do you mean by a substance?
(a) What are combustible substances ? Name three combustible substances.
(b) What are non-combustible substances ? Name three non-combustible substances.