Class 6 Science Chapter 7 Temperature and its Measurement – NCERT Solutions, Notes & Worksheet

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Class 6 Science Chapter 7 – Temperature and its Measurement

NCERT Curiosity | Class 6 Science | Chapter 7 | NCERT Solutions | 2026–27

CHAPTER IDEA
Temperature tells us how hot or cold a body is. A thermometer gives a reliable way to measure temperature.

๐ŸŒก️ Clean Notes – Temperature and its Measurement

1. Hot or Cold?

Our sense of touch cannot always tell us correctly whether something is hot or cold. The same water may feel different to different hands after they have been exposed to warm or cold water.

Key Idea: We cannot always rely on touch to judge temperature accurately.

2. Temperature

Temperature is a reliable measure of the hotness or coldness of a body. A hotter body has a higher temperature than a colder body.

Higher temperature → Hotter   |   Lower temperature → Cooler

3. Thermometer

A thermometer is a device used to measure temperature.

Two common types are:

  • Clinical thermometer – used to measure human body temperature.
  • Laboratory thermometer – used for measuring the temperature of substances during experiments.

4. Clinical Thermometer

A digital clinical thermometer is used to measure body temperature. It uses heat sensors and displays the temperature digitally.

Normal temperature: The average normal body temperature of a healthy adult is taken as 37.0 °C or 98.6 °F. However, a healthy person's actual temperature may be slightly higher or lower.

5. Temperature Scales

The chapter discusses three temperature scales:

  • Celsius scale – unit: degree Celsius (°C)
  • Fahrenheit scale – unit: degree Fahrenheit (°F)
  • Kelvin scale – unit: kelvin (K)
Important: The SI unit of temperature is kelvin (K).
Conversion: Temperature in kelvin = Temperature in Celsius + 273.15

6. Laboratory Thermometer

A laboratory thermometer has a bulb containing a liquid and a Celsius scale along the tube. The liquid column rises or falls when temperature changes.

Typical range in the textbook example: −10 °C to 110 °C

7. Least Count / Smallest Reading

The smallest temperature value a thermometer can measure depends on the number of divisions on its scale.

Example: If the difference between two large marks is 10 °C and there are 10 small divisions, each small division represents 1 °C.

8. Correct Use of a Laboratory Thermometer

  • Keep the thermometer vertical.
  • Do not let the bulb touch the bottom or sides of the beaker.
  • Keep the bulb properly immersed in the substance being measured.
  • Read the temperature while the thermometer is still immersed.
  • Keep your eye directly in line with the top of the liquid column.

9. Air Temperature

Room and air temperatures can be measured using suitable thermometers. Weather reports commonly give the maximum and minimum air temperature of a day.

Weather link: Air temperature changes with weather conditions and seasons, so maximum and minimum temperatures can vary from day to day.

⭐ Key Points to Remember

  • Touch is not always a reliable way to compare temperatures.
  • A thermometer is used to measure temperature.
  • Clinical thermometers measure body temperature.
  • Laboratory thermometers are used for experiments.
  • 37.0 °C is taken as the average normal body temperature of a healthy adult.
  • 37.0 °C = 98.6 °F.
  • The SI unit of temperature is kelvin (K).
  • The laboratory thermometer in the textbook example has a range of −10 °C to 110 °C.

NCERT Class 6 Science Chapter 7 – Textbook Question Answers

Temperature and its Measurement – Let us Enhance Our Learning

Q1. The normal temperature of a healthy human being is close to ______.

(i) 98.6 °C    (ii) 37.0 °C    (iii) 32.0 °C    (iv) 27.0 °C

Answer: (ii) 37.0 °C
Q2. 37 °C is the same temperature as ______.

(i) 97.4 °F    (ii) 97.6 °F    (iii) 98.4 °F    (iv) 98.6 °F

Answer: (iv) 98.6 °F
Q3. Fill in the blanks:

(i) The hotness or coldness of a system is determined by its ______.
(ii) The temperature of ice-cold water cannot be measured by a ______ thermometer.
(iii) The unit of temperature is degree ______.

Answers:
(i) temperature
(ii) clinical
(iii) Celsius
Q4. The range of a laboratory thermometer is usually ______.

(i) 10 °C to 100 °C    (ii) −10 °C to 110 °C    (iii) 32 °C to 45 °C    (iv) 35 °C to 42 °C

Answer: (ii) −10 °C to 110 °C
Q5. Four students used a laboratory thermometer to measure the temperature of water as shown in Fig. 7.6. Who do you think followed the correct way for measuring temperature?

(i) Student 1    (ii) Student 2    (iii) Student 3    (iv) Student 4

Answer: (ii) Student 2.
The thermometer is held vertically, the bulb is immersed correctly and it is not touching the bottom or sides of the container.
Q6. Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below:

Answer: Mark the red column up to the following readings:
• First thermometer → 14 °C
• Second thermometer → 17 °C
• Third thermometer → 7.5 °C
Q7. Observe the part of thermometer shown in Fig. 7.8 and answer the following questions:

(i) What type of thermometer is it?
Answer: It is a laboratory thermometer.

(ii) What is the reading of the thermometer?
Answer: 26 °C.

(iii) What is the smallest value that this thermometer can measure?
Answer: 1 °C.
Q8. A laboratory thermometer is not used to measure our body temperature. Give a reason.

Answer: A laboratory thermometer is designed for laboratory measurements and does not have the special arrangement needed for convenient body-temperature measurement. A clinical thermometer is intended for measuring human body temperature.
Q9. Vaishnavi has not gone to school as she is ill. Her mother has kept a record of her body temperature for three days as shown in Table 7.4.

(i) What was Vaishnavi’s highest recorded temperature?
Answer: 40.0 °C.

(ii) On which day and at what time was Vaishnavi’s highest temperature recorded?
Answer: On Day One at 7 pm.

(iii) On which day did Vaishnavi’s temperature return to normal?
Answer: On Day Three.
Q10. If you have to measure the temperature 22.5 °C, which of the following three thermometers will you use (Fig. 7.9)? Explain.

Answer: Thermometer (b) should be used because its scale has sufficiently small divisions to measure 22.5 °C accurately.
Q11. The temperature shown by the thermometer in Fig. 7.10 is:

(i) 28.0 °C    (ii) 27.5 °C    (iii) 26.5 °C    (iv) 25.3 °C

Answer: (ii) 27.5 °C.
Q12. A laboratory thermometer has 50 divisions between 0 °C and 100 °C. What does each division of this thermometer measure?

Answer:
Temperature difference = 100 °C − 0 °C = 100 °C
Number of divisions = 50
Value of one division = 100 ÷ 50 = 2 °C

Therefore, each division measures 2 °C.
Q13. Draw the scale of a thermometer in which the smallest division reads 0.5 °C. You may draw only the portion between 10 °C and 20 °C.

Answer: Draw a scale from 10 °C to 20 °C and divide every 1 °C interval into two equal parts. Each small division will then represent 0.5 °C.
Q14. Komal tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?

Answer: She means 101 °F (Fahrenheit). A body temperature of 101 °C would be far beyond the normal human-body range.

Important Extra Questions and Answers

1. What is temperature?
Temperature is a reliable measure of how hot or cold a body is.
2. Name the three temperature scales mentioned in the chapter.
Celsius, Fahrenheit and Kelvin.
3. What is the SI unit of temperature?
The SI unit of temperature is kelvin (K).
4. Why should the bulb of a laboratory thermometer not touch the beaker?
Because it should measure the temperature of the substance, not the temperature of the container.
5. Why should the temperature be read while the thermometer is still immersed?
Because the liquid column can change as soon as the thermometer is removed from the substance.

Class 6 Science Chapter 7 Worksheet

Temperature and its Measurement – Practice Worksheet

A. Multiple Choice Questions

1. Which instrument is used to measure temperature?
A. Balance   B. Thermometer   C. Compass   D. Ruler

2. The SI unit of temperature is:
A. °C   B. °F   C. K   D. m

3. The normal average body temperature is close to:
A. 25 °C   B. 37 °C   C. 50 °C   D. 100 °C

4. Which thermometer is used for laboratory experiments?
A. Clinical thermometer   B. Laboratory thermometer   C. Barometer   D. Compass

5. 37 °C is equal to:
A. 97.4 °F   B. 98.6 °F   C. 100 °F   D. 101 °F

B. Fill in the Blanks

1. The hotness or coldness of a body is described by its ________.

2. A device used to measure temperature is called a ________.

3. The SI unit of temperature is ________.

4. A clinical thermometer measures ________ temperature.

5. A laboratory thermometer is used during ________ experiments.

C. True or False

1. Touch always gives an accurate measurement of temperature.

2. A clinical thermometer is used to measure body temperature.

3. The SI unit of temperature is kelvin.

4. The bulb of a laboratory thermometer should touch the bottom of a beaker.

5. 37.0 °C is equal to 98.6 °F.

D. Short Answer Questions

1. Why can we not always rely on our sense of touch to judge temperature?

2. What is the difference between a clinical thermometer and a laboratory thermometer?

3. Why should a laboratory thermometer be kept vertical?

4. What is the relation between Celsius and Kelvin scales given in the chapter?

5. Why are weather reports interested in maximum and minimum air temperatures?

Answer Key

MCQs: 1-B, 2-C, 3-B, 4-B, 5-B

Fill in the Blanks: 1. temperature, 2. thermometer, 3. kelvin, 4. body, 5. laboratory

True or False: 1. False, 2. True, 3. True, 4. False, 5. True
⭐ QUICK STUDY TIP

Remember these core facts: 37.0 °C = 98.6 °F, the SI unit is kelvin (K), and a laboratory thermometer in the textbook example ranges from −10 °C to 110 °C.

Source: NCERT Class 6 Science – Curiosity, Chapter 7: Temperature and its Measurement, Reprint 2026–27.

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