Page 7 - COMPOSITION AND PROPERTIES OF AIR

C
A
R
3. CARBON DIOXIDE:
D
:
E
D
IO
X

B
O
N
I
•Plants need carbon dioxide to
prepare their own food by the process
of photosynthesis. All animals directly
or indirectly depend on plants for
food.

•Carbon dioxide is a very small

(only 0.03% by volume) component of
air and is a by-product of respiration

by humans and animals.

•Fire also uses up oxygen to burn and
then produces carbon dioxide and a

few other gases upon burning. This is

why we feel suffocated if there is
something burning inside a room. This

happens due to an excess of carbon

dioxide as the fire continues to burn

in the room, choking out oxygen in the
air.