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NCERT Textbook: Experiments with Water - EVS Class 5

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 Page 1


60 Looking Around
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.
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
Think what would happen if
 Ayesha put a puffed puri in a bowl of water. Would
it sink or float?
 You put a steel plate on water. Would it sink or
float? What would happen to a spoon?
 Would the cap of a plastic bottle sink
or float on water?
Page 2


60 Looking Around
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.
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
Think what would happen if
 Ayesha put a puffed puri in a bowl of water. Would
it sink or float?
 You put a steel plate on water. Would it sink or
float? What would happen to a spoon?
 Would the cap of a plastic bottle sink
or float on water?
Experiments with Water 61
Why, Oh Why?
A wooden boat
in water will float.
But a needle will sink!
Why does this happen?
Let me think...
An iron ship
will also float,
though its’ much heavier
than my boat!
Do this and find out
Do this experiment in groups of four friends. Each group
will need a big pot filled with water and the things
listed in the table. Put each thing one-by-one in water
and observe.
her hands. It started floating on water. Ayesha
gently put the soap in the soap case. She saw
that the case continued to float, even with the
soap in it.
Have you seen that some thing float on
water while others sink? Think how this
happens! The poem here raises such
questions.
But a needle,
light as a leaf,
thin as a pin,
will sink right in!
Why does this happen?
Let me think...
– Shishir Shobhan Ashthana
Chakmak, December 1985
(Translated by Anupa Lal)
Page 3


60 Looking Around
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.
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
Think what would happen if
 Ayesha put a puffed puri in a bowl of water. Would
it sink or float?
 You put a steel plate on water. Would it sink or
float? What would happen to a spoon?
 Would the cap of a plastic bottle sink
or float on water?
Experiments with Water 61
Why, Oh Why?
A wooden boat
in water will float.
But a needle will sink!
Why does this happen?
Let me think...
An iron ship
will also float,
though its’ much heavier
than my boat!
Do this and find out
Do this experiment in groups of four friends. Each group
will need a big pot filled with water and the things
listed in the table. Put each thing one-by-one in water
and observe.
her hands. It started floating on water. Ayesha
gently put the soap in the soap case. She saw
that the case continued to float, even with the
soap in it.
Have you seen that some thing float on
water while others sink? Think how this
happens! The poem here raises such
questions.
But a needle,
light as a leaf,
thin as a pin,
will sink right in!
Why does this happen?
Let me think...
– Shishir Shobhan Ashthana
Chakmak, December 1985
(Translated by Anupa Lal)
62 Looking Around
(a) Empty bowl (katori)
(b) After putting in 6-7 small pebbles,
one-by-one
Iron nail or pin
Matchstick
(a) Empty plastic bottle with its lid
closed
(b) bottle half-filled with water
(c) Bottle full of water
Aluminium foil (from medicine
packing)
(a) open and spread out
(b) pressed tightly into a ball
(c) in a cup-like shape
(a) Soap cake
(b) Soap cake on a small plastic plate
A piece of ice
I saw, when I
did it
I guessed, before I
did it
Mark [?] for the things that float. Mark [?] for those that sink.
Things to be put in water
Find out from the other groups which things floated and which
sank in the water?
After doing the experiment, fill in the blanks.
1. The iron nail ______ in water but the katori ______. I think
this happened because _________________________________
2. The empty plastic bottle ______ on water. The bottle filled
with water ______ because ______________________________
3. The aluminium foil ______ when it was spread out. When
pressed tightly into a ball it __________. This may have
happened because ____________________________________
Page 4


60 Looking Around
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.
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
Think what would happen if
 Ayesha put a puffed puri in a bowl of water. Would
it sink or float?
 You put a steel plate on water. Would it sink or
float? What would happen to a spoon?
 Would the cap of a plastic bottle sink
or float on water?
Experiments with Water 61
Why, Oh Why?
A wooden boat
in water will float.
But a needle will sink!
Why does this happen?
Let me think...
An iron ship
will also float,
though its’ much heavier
than my boat!
Do this and find out
Do this experiment in groups of four friends. Each group
will need a big pot filled with water and the things
listed in the table. Put each thing one-by-one in water
and observe.
her hands. It started floating on water. Ayesha
gently put the soap in the soap case. She saw
that the case continued to float, even with the
soap in it.
Have you seen that some thing float on
water while others sink? Think how this
happens! The poem here raises such
questions.
But a needle,
light as a leaf,
thin as a pin,
will sink right in!
Why does this happen?
Let me think...
– Shishir Shobhan Ashthana
Chakmak, December 1985
(Translated by Anupa Lal)
62 Looking Around
(a) Empty bowl (katori)
(b) After putting in 6-7 small pebbles,
one-by-one
Iron nail or pin
Matchstick
(a) Empty plastic bottle with its lid
closed
(b) bottle half-filled with water
(c) Bottle full of water
Aluminium foil (from medicine
packing)
(a) open and spread out
(b) pressed tightly into a ball
(c) in a cup-like shape
(a) Soap cake
(b) Soap cake on a small plastic plate
A piece of ice
I saw, when I
did it
I guessed, before I
did it
Mark [?] for the things that float. Mark [?] for those that sink.
Things to be put in water
Find out from the other groups which things floated and which
sank in the water?
After doing the experiment, fill in the blanks.
1. The iron nail ______ in water but the katori ______. I think
this happened because _________________________________
2. The empty plastic bottle ______ on water. The bottle filled
with water ______ because ______________________________
3. The aluminium foil ______ when it was spread out. When
pressed tightly into a ball it __________. This may have
happened because ____________________________________
Experiments with Water 63
Teacher’s Note : It is not expected that children should be told about density. We
should accept different answers that children may give, such as water is ‘heavy’ or
‘thick’.
Is it magic?
When Ayesha woke up in the morning, Ammi had fever. Abbu made
some tea and went to give medicines to Ammi. He told Ayesha, “You
boil eggs. Also put some salt in the water.” Ayesha took water in
a pot. By mistake she put too much salt in the water. She saw
the eggs at the bottom of the pot come up a little and start to
float in water!
 Take some water in a glass. Put a lemon in it. Now keep
putting salt in the water, half-a-spoon at a time. Were you
able to float your lemon in water?
 What do you think, the lemon floated in salty water,
because......
What dissolved, what did not?
On Sunday Ayesha’s cousin brother Hamid came to her house
to play. As soon as he came he asked his aunt to make his
favourite shakkarpara (a sweet dish). Ammi said, “Let me come
back from the market, then I will make some for you. Why
don’t you help me? Take two glasses of water and put a bowl of
sugar in it. Mix it till it dissolves.” Hamid thought, “Let me
finish this work fast. Then I will watch TV”.
 Suggest some ways to Hamid for quickly dissolving sugar.
Dead Sea
All oceans and seas have salty water. The saltiest of all is
the Dead Sea. How salty? Imagine 300 grams of salt in one
litre of water! Would you be able to even taste such salty
water? It would be very bitter. Interestingly, even if a person
does not know how to swim, she would not drown in this
sea. She will float in water, as if lying down on it!
Remember the lemon you floated in salty water?
Page 5


60 Looking Around
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.
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
Think what would happen if
 Ayesha put a puffed puri in a bowl of water. Would
it sink or float?
 You put a steel plate on water. Would it sink or
float? What would happen to a spoon?
 Would the cap of a plastic bottle sink
or float on water?
Experiments with Water 61
Why, Oh Why?
A wooden boat
in water will float.
But a needle will sink!
Why does this happen?
Let me think...
An iron ship
will also float,
though its’ much heavier
than my boat!
Do this and find out
Do this experiment in groups of four friends. Each group
will need a big pot filled with water and the things
listed in the table. Put each thing one-by-one in water
and observe.
her hands. It started floating on water. Ayesha
gently put the soap in the soap case. She saw
that the case continued to float, even with the
soap in it.
Have you seen that some thing float on
water while others sink? Think how this
happens! The poem here raises such
questions.
But a needle,
light as a leaf,
thin as a pin,
will sink right in!
Why does this happen?
Let me think...
– Shishir Shobhan Ashthana
Chakmak, December 1985
(Translated by Anupa Lal)
62 Looking Around
(a) Empty bowl (katori)
(b) After putting in 6-7 small pebbles,
one-by-one
Iron nail or pin
Matchstick
(a) Empty plastic bottle with its lid
closed
(b) bottle half-filled with water
(c) Bottle full of water
Aluminium foil (from medicine
packing)
(a) open and spread out
(b) pressed tightly into a ball
(c) in a cup-like shape
(a) Soap cake
(b) Soap cake on a small plastic plate
A piece of ice
I saw, when I
did it
I guessed, before I
did it
Mark [?] for the things that float. Mark [?] for those that sink.
Things to be put in water
Find out from the other groups which things floated and which
sank in the water?
After doing the experiment, fill in the blanks.
1. The iron nail ______ in water but the katori ______. I think
this happened because _________________________________
2. The empty plastic bottle ______ on water. The bottle filled
with water ______ because ______________________________
3. The aluminium foil ______ when it was spread out. When
pressed tightly into a ball it __________. This may have
happened because ____________________________________
Experiments with Water 63
Teacher’s Note : It is not expected that children should be told about density. We
should accept different answers that children may give, such as water is ‘heavy’ or
‘thick’.
Is it magic?
When Ayesha woke up in the morning, Ammi had fever. Abbu made
some tea and went to give medicines to Ammi. He told Ayesha, “You
boil eggs. Also put some salt in the water.” Ayesha took water in
a pot. By mistake she put too much salt in the water. She saw
the eggs at the bottom of the pot come up a little and start to
float in water!
 Take some water in a glass. Put a lemon in it. Now keep
putting salt in the water, half-a-spoon at a time. Were you
able to float your lemon in water?
 What do you think, the lemon floated in salty water,
because......
What dissolved, what did not?
On Sunday Ayesha’s cousin brother Hamid came to her house
to play. As soon as he came he asked his aunt to make his
favourite shakkarpara (a sweet dish). Ammi said, “Let me come
back from the market, then I will make some for you. Why
don’t you help me? Take two glasses of water and put a bowl of
sugar in it. Mix it till it dissolves.” Hamid thought, “Let me
finish this work fast. Then I will watch TV”.
 Suggest some ways to Hamid for quickly dissolving sugar.
Dead Sea
All oceans and seas have salty water. The saltiest of all is
the Dead Sea. How salty? Imagine 300 grams of salt in one
litre of water! Would you be able to even taste such salty
water? It would be very bitter. Interestingly, even if a person
does not know how to swim, she would not drown in this
sea. She will float in water, as if lying down on it!
Remember the lemon you floated in salty water?
64 Looking Around
Tell
 Could you see the salt after it dissolved in water? If no,
why?
 Does that mean that now the water does not have salt?
If it has, then where is the salt?
 What difference did you see – in the water with salt, and
the water with chalk powder – after keeping for sometime?
 Which of the two would you be able to separate from the
water by straining with a cloth – salt or chalk powder?
1. Salt
2. Soil
3. Chalk powder
4. 1 spoon milk
5. Oil
What happened after
keeping for 2 minutes?
Things
Did it dissolve
or not?
Teacher’s Note : There are many things which cannot be easily labelled as soluble
or insoluble. These categories are anyway not needed here. Children need to be
encouraged to fill the table on the basis of their own observations.
Do this experiment
Make groups of four friends. For the experiment you will
need 4-5 glasses or bowls, spoons, water, and the things
listed in the table. Take some water in each glass. Now try
to dissolve one thing in one glass. Observe what happens
and note in the table.
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FAQs on NCERT Textbook: Experiments with Water - EVS Class 5

1. What are some common experiments that can be conducted with water?
Ans. Some common experiments that can be conducted with water include observing the effects of temperature on water, studying the properties of water through density experiments, investigating water absorption in different materials, examining the effects of water on plant growth, and exploring the process of water purification.
2. How can temperature affect the behavior of water?
Ans. Temperature can affect the behavior of water in various ways. When heated, water molecules gain energy and move faster, leading to an increase in volume. This is why water boils at 100 degrees Celsius. On the other hand, when water is cooled, the molecules slow down and move closer together, resulting in a decrease in volume. This is why water freezes at 0 degrees Celsius.
3. Can water absorb different substances?
Ans. Yes, water has the ability to absorb different substances. Water is known as the "universal solvent" because it can dissolve a wide range of solutes, including salts, sugars, gases, and many other substances. This property allows water to transport nutrients and minerals in living organisms, as well as dissolve pollutants in the environment.
4. How does water play a role in plant growth?
Ans. Water plays a crucial role in plant growth as it is the main component of plant cells and is involved in various physiological processes. Water helps transport nutrients and minerals from the soil to the roots of plants. It also enables the process of photosynthesis, where plants convert sunlight into energy for growth. Additionally, water helps regulate the temperature of plants through transpiration.
5. What are some methods of water purification?
Ans. There are several methods of water purification, including filtration, disinfection, and distillation. Filtration involves passing water through a porous material to remove impurities. Disinfection methods, such as chlorination or ultraviolet (UV) radiation, kill or inactivate harmful microorganisms. Distillation involves boiling water and collecting the condensed vapor to separate it from impurities. Other methods, like reverse osmosis and activated carbon adsorption, are also used for water purification.
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