NCERT Textbook: Temperature and its Measurement

# NCERT Textbook: Temperature and its Measurement | Science Class 6 PDF Download

``` Page 1

Temperature and
its Measurement
7 Chapter
Lambok and his elder sister
Phiban live in Shillong. One day
they came home from school.
Their parents were away at
work and Lambok complained
that he was feeling feverish.
and felt that he might be
having a fever . To confirm this,
she took out the thermometer
kept in the almirah. She
washed its tip with soap and
water, and measured Lambok’s
temperature. To her relief, she
found that his temperature
was normal. She washed the
thermometer tip again, dried
Wrong measurements are worse than
no measurements at all.
— Anna Mani
7.1 Hot or Cold?
We know from experience that some bodies are hotter than
others. For example, during summers, the tap water may be
hotter than the cold water from a matka (earthen pot) or a
it and put it back. She then asked
Lambok to change his school
uniform, eat his lunch, and rest for
some time.
Can it always be
correctly judged, that
a person has fever,
only by touching the
person?
?
Chapter 7.indd   123 10-07-2024   12:50:47
Page 2

Temperature and
its Measurement
7 Chapter
Lambok and his elder sister
Phiban live in Shillong. One day
they came home from school.
Their parents were away at
work and Lambok complained
that he was feeling feverish.
and felt that he might be
having a fever . To confirm this,
she took out the thermometer
kept in the almirah. She
washed its tip with soap and
water, and measured Lambok’s
temperature. To her relief, she
found that his temperature
was normal. She washed the
thermometer tip again, dried
Wrong measurements are worse than
no measurements at all.
— Anna Mani
7.1 Hot or Cold?
We know from experience that some bodies are hotter than
others. For example, during summers, the tap water may be
hotter than the cold water from a matka (earthen pot) or a
it and put it back. She then asked
Lambok to change his school
uniform, eat his lunch, and rest for
some time.
Can it always be
correctly judged, that
a person has fever,
only by touching the
person?
?
Chapter 7.indd   123 10-07-2024   12:50:47
Curiosity | Textbook of Science| Grade 6
124
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
— What will my right hand feel on dipping in B?

— What will my left hand feel on dipping in B?

? Now, conduct the activity and write your observations.

Fig. 7.1: Feeling hotness or coldness of water by dipping hands
A B C A B C
Chapter 7.indd   124 10-07-2024   12:50:48
Page 3

Temperature and
its Measurement
7 Chapter
Lambok and his elder sister
Phiban live in Shillong. One day
they came home from school.
Their parents were away at
work and Lambok complained
that he was feeling feverish.
and felt that he might be
having a fever . To confirm this,
she took out the thermometer
kept in the almirah. She
washed its tip with soap and
water, and measured Lambok’s
temperature. To her relief, she
found that his temperature
was normal. She washed the
thermometer tip again, dried
Wrong measurements are worse than
no measurements at all.
— Anna Mani
7.1 Hot or Cold?
We know from experience that some bodies are hotter than
others. For example, during summers, the tap water may be
hotter than the cold water from a matka (earthen pot) or a
it and put it back. She then asked
Lambok to change his school
uniform, eat his lunch, and rest for
some time.
Can it always be
correctly judged, that
a person has fever,
only by touching the
person?
?
Chapter 7.indd   123 10-07-2024   12:50:47
Curiosity | Textbook of Science| Grade 6
124
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
— What will my right hand feel on dipping in B?

— What will my left hand feel on dipping in B?

? Now, conduct the activity and write your observations.

Fig. 7.1: Feeling hotness or coldness of water by dipping hands
A B C A B C
Chapter 7.indd   124 10-07-2024   12:50:48
Temperature and its Measurement
125
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
Then how do we
find out how hot
or cold a body
is?
Fig.7.2: A digital clinical thermometer
Tip
Chapter 7.indd   125 10-07-2024   12:50:49
Page 4

Temperature and
its Measurement
7 Chapter
Lambok and his elder sister
Phiban live in Shillong. One day
they came home from school.
Their parents were away at
work and Lambok complained
that he was feeling feverish.
and felt that he might be
having a fever . To confirm this,
she took out the thermometer
kept in the almirah. She
washed its tip with soap and
water, and measured Lambok’s
temperature. To her relief, she
found that his temperature
was normal. She washed the
thermometer tip again, dried
Wrong measurements are worse than
no measurements at all.
— Anna Mani
7.1 Hot or Cold?
We know from experience that some bodies are hotter than
others. For example, during summers, the tap water may be
hotter than the cold water from a matka (earthen pot) or a
it and put it back. She then asked
Lambok to change his school
uniform, eat his lunch, and rest for
some time.
Can it always be
correctly judged, that
a person has fever,
only by touching the
person?
?
Chapter 7.indd   123 10-07-2024   12:50:47
Curiosity | Textbook of Science| Grade 6
124
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
— What will my right hand feel on dipping in B?

— What will my left hand feel on dipping in B?

? Now, conduct the activity and write your observations.

Fig. 7.1: Feeling hotness or coldness of water by dipping hands
A B C A B C
Chapter 7.indd   124 10-07-2024   12:50:48
Temperature and its Measurement
125
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
Then how do we
find out how hot
or cold a body
is?
Fig.7.2: A digital clinical thermometer
Tip
Chapter 7.indd   125 10-07-2024   12:50:49
Curiosity | Textbook of Science| Grade 6
126
Do you
know?
Earlier, mercury thermometers were used for measuring
the body temperature. But mercury is an extremely toxic
substance and is difficult to dispose of if the thermometer
breaks accidently.
Digital thermometers pose no such risk and also the
numbers in its display are easier to read. Therefore,
mercury thermometers are being replaced by digital
thermometers. Temperature in a digital thermometer
is determined with the help of heat sensors.
temperature when the thermometer is placed in contact
with a person’s body.
For measuring temperature, the clinical thermometers
generally use a scale called the Celsius scale. On this
scale, the unit of temperature is degree Celsius and is
denoted by °C.
They are non-contact thermometers,
also called infrared
thermometers. Such
thermometers can
measure temperature
without touching a
person’s body and
thus reduce the risk of
During the COVID-19
pandemic, some special
thermometers were used,
which could measure the
temperature of a person
from a distance. What were
those?
Chapter 7.indd   126 10-07-2024   12:50:58
Page 5

Temperature and
its Measurement
7 Chapter
Lambok and his elder sister
Phiban live in Shillong. One day
they came home from school.
Their parents were away at
work and Lambok complained
that he was feeling feverish.
and felt that he might be
having a fever . To confirm this,
she took out the thermometer
kept in the almirah. She
washed its tip with soap and
water, and measured Lambok’s
temperature. To her relief, she
found that his temperature
was normal. She washed the
thermometer tip again, dried
Wrong measurements are worse than
no measurements at all.
— Anna Mani
7.1 Hot or Cold?
We know from experience that some bodies are hotter than
others. For example, during summers, the tap water may be
hotter than the cold water from a matka (earthen pot) or a
it and put it back. She then asked
Lambok to change his school
uniform, eat his lunch, and rest for
some time.
Can it always be
correctly judged, that
a person has fever,
only by touching the
person?
?
Chapter 7.indd   123 10-07-2024   12:50:47
Curiosity | Textbook of Science| Grade 6
124
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
— What will my right hand feel on dipping in B?

— What will my left hand feel on dipping in B?

? Now, conduct the activity and write your observations.

Fig. 7.1: Feeling hotness or coldness of water by dipping hands
A B C A B C
Chapter 7.indd   124 10-07-2024   12:50:48
Temperature and its Measurement
125
refrigerator . We can realise this by merely touching the two
samples of water. But can we always rely upon our sense of
touch? Let us find out.
Activity 7.1: Let us investigate
? Take three large containers and label them A, B and C,
as shown in Fig. 7.1.
? Pour warm water in container A, tap water in B and ice-
cold water in C.
? We will conduct this activity in two parts — prediction
and observation.
? Firstly, predict what will you feel if you
— dip your right hand in A and left hand in C and
keep them there for 1–2 minutes.
— take out your hands from containers A and C, and
place both hands simultaneously in B.
predictions. Did your right hand feel that the water in
container B is cool, while your left hand felt that
the same water is warm? What do you infer
from these observations?
We cannot always rely upon our sense of
touch to decide correctly whether a body is
hot or cold.
7.2 Temperature
A reliable measure of hotness (or coldness) of a body is
its temperature. A hotter body has a higher temperature
than a colder body.  The difference in temperature between
the two bodies tells us how hot a body is in comparison to
another body.  A device that measures temperature is called
a thermometer.
There are two kinds of thermometers that you are likely
to come across—clinical thermometers and laboratory
thermometers. Clinical thermometers are used to
measure human body temperatures whereas laboratory
thermometers are used for many other purposes. Let us
to measure temperature.
7.3  Measuring Temperature
7.3.1 Clinical thermometer
You might be familiar with a thermometer , like that shown in
Fig. 7.2, which is used for measuring our body temperature.
It is called a clinical thermometer . Such thermometers show
temperatures digitally. These are also known as digital
clinical thermometers and run on batteries. These measure
Then how do we
find out how hot
or cold a body
is?
Fig.7.2: A digital clinical thermometer
Tip
Chapter 7.indd   125 10-07-2024   12:50:49
Curiosity | Textbook of Science| Grade 6
126
Do you
know?
Earlier, mercury thermometers were used for measuring
the body temperature. But mercury is an extremely toxic
substance and is difficult to dispose of if the thermometer
breaks accidently.
Digital thermometers pose no such risk and also the
numbers in its display are easier to read. Therefore,
mercury thermometers are being replaced by digital
thermometers. Temperature in a digital thermometer
is determined with the help of heat sensors.
temperature when the thermometer is placed in contact
with a person’s body.
For measuring temperature, the clinical thermometers
generally use a scale called the Celsius scale. On this
scale, the unit of temperature is degree Celsius and is
denoted by °C.
They are non-contact thermometers,
also called infrared
thermometers. Such
thermometers can
measure temperature
without touching a
person’s body and
thus reduce the risk of
During the COVID-19
pandemic, some special
thermometers were used,
which could measure the
temperature of a person
from a distance. What were
those?
Chapter 7.indd   126 10-07-2024   12:50:58
Temperature and its Measurement
127
Activity 7.2: Let us measure
Let us now use a digital clinical thermometer
to measure body temperature. You may
measure your own temperature as well as
the temperature of some of your friends.
Talk to your friends to find out who would
be willing to get their body temperatures
measured by you.
? Wash your hands and the tip of the
digital thermometer with soap and
water.
? Reset the thermometer by pressing the
reset button.
? Place the thermometer under the
? Wait till the thermometer makes a
beeping sound or flashes a light.
? Take it out from the mouth and read
the temperature on the digital display.
? Record the temperature in Table 7.1.
? Clean the tip of the thermometer with soap and water,
and dry it.
? Repeat the above steps for measuring the temperatures
Table 7.1: Body temperatures of 10 persons
Precautions
to be taken while
using a digital clinical
thermometer
• To be used after reading the
instruction manual of the
thermometer.
• Tip of the thermometer to
be washed with soap and
water before and after use.
• While washing, care to be
taken to keep the digital
portion such as the display
out of water.
• Do not hold the thermometer
by the tip.
S. no. Name Temperature (°C)
1
.
.
.
.
10
Chapter 7.indd   127 10-07-2024   12:50:59
```

## Science Class 6

99 videos|260 docs|49 tests

## FAQs on NCERT Textbook: Temperature and its Measurement - Science Class 6

 1. How is temperature measured?
Ans. Temperature is measured using a thermometer. The most common types of thermometers are mercury thermometers and digital thermometers.
 2. What is the unit of temperature measurement?
Ans. The unit of temperature measurement is degrees Celsius (°C) in the metric system and degrees Fahrenheit (°F) in the imperial system.
 3. How does temperature affect our daily lives?
Ans. Temperature affects our daily lives in various ways, such as influencing the weather, determining what clothes we wear, affecting food preparation, and impacting our overall comfort.
 4. What are the different scales used to measure temperature?
Ans. The most commonly used scales to measure temperature are Celsius, Fahrenheit, and Kelvin. Celsius is used in most countries, Fahrenheit is primarily used in the United States, and Kelvin is used in scientific contexts.
 5. Can temperature be measured in negative values?
Ans. Yes, temperature can be measured in negative values. For example, when the temperature is below freezing, it is recorded as a negative value on the Celsius and Fahrenheit scales.

## Science Class 6

99 videos|260 docs|49 tests

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