NCERT Book Class 5 EVS Chapter 7 Experiments with Water

7. Experiments with Water

What floats – what sinks?
Ayesha was waiting for dinner. Today Ammi was making her
favourite food – puri and spicy potatoes.
Ayesha watched as her mother rolled out the puri and put
it in the hot oil. She saw that at first the puri sank to the
bottom of the pan. As it puffed up, the puri came up and
started floating on the oil. One puri did not puff up and did
not float like the others. On seeing this, Ayesha took some
dough and rolled it into a ball. She flattened it and put it in
a bowl of water. Alas! it sank to the bottom and stayed there.

Think what would happen if
w Ayesha put a puffed puri in a bowl of water. Would
it sink or float?
w You put a steel plate on water. Would it sink or
float? What would happen to a spoon?
w Would the cap of a plastic bottle sink
or float on water?

In the evening Ayesha went for
a bath. She had just come out
when her mother called, “Ayesha,
you have dropped the soap in the
water again. Take it out and put it
in the soap case.” Ayesha was in a
hurry and the soap case fell out of

60 Looking Around