Why can you smell the perfume of incense stick ?

Why can you smell the perfume of incense stick ?

Why cannot you smell its perfume at a short distance when incense stick is not lighted ?

Why is the smell of the perfume of incense stick filled the whole room in few minutes, when lighted ?

Why do we smell the fragrance of an incense stick?

a) Convert the following temperature to the Celsius scale.

(i) 293 K (ii) 470 K

b) Why can you smell the perfume of incense stick ?
c) Why does the temperature of a substance remain constant during its melting point or boiling point?
d) Which amongst the following is not matter?
(i). Brick
(ii) Pen
(iii) Time
Give reason.