Class 6 Science Chapter 7 Summary Notes PDF Download
Vedantu provides Class 6 Chapter 7 Temperature and its Measurement Notes PDF, in which students will explore the concept of temperature and how it is measured. These notes are according to the latest Class 6 Science Syllabus. This chapter covers what temperature is, its importance in our daily lives, and the tools used to measure it, such as thermometers.
Table of Content
You’ll learn how temperature affects the environment and various aspects of life. The chapter provides a clear understanding of how to use thermometers and read temperature measurements accurately. This foundation will help you grasp both basic scientific concepts and practical applications related to temperature. By studying Class 6 Science Notes PDF With clear explanations and examples, you’ll be well-prepared for your exams and score well in the exams.
Hot or Cold?
Lambok felt feverish and his sister Phiban used a thermometer to confirm if he had a fever. Just by touching his forehead, it was difficult to accurately judge if he had a fever or not. This emphasises the importance of using proper tools like thermometers for accurate measurement.
Activity :
Students experiment with three containers of water: one with warm water, one with room temperature water, and one with ice-cold water.
They dip their hands into the warm and cold water separately, then place both hands in the room-temperature water. This activity shows that the sense of touch can be unreliable in judging temperature differences.
Temperature:
Temperature is a reliable measure of how hot or cold a body is. A hotter body has a higher temperature than a colder body.
Thermometer:
A device used to measure temperature.
Clinical thermometers are used to measure human body temperature.
Laboratory thermometers are used for various other scientific purposes.
Measuring Temperature
Clinical Thermometer:
Clinical thermometers are used to measure body temperature. The temperature is usually measured in degrees Celsius (°C).
Earlier, mercury thermometers were used, but due to safety concerns with mercury, digital thermometers are now more commonly used.
Digital Thermometers:
Digital thermometers use sensors to detect temperature and display it in numbers, making them easier to use and read.
During the COVID-19 pandemic, non-contact thermometers (infrared thermometers) were used to measure temperature from a distance, reducing the risk of infection spread.
Activity 7.2: Let Us Measure
This activity teaches students how to use a digital clinical thermometer to measure body temperature:
Steps include washing hands, placing the thermometer under the tongue, waiting for a beep, and reading the temperature on the digital display.
Students record the temperatures of several classmates and compare the data.
Normal Body Temperature:
The normal human body temperature is approximately 37.0°C, but this can vary slightly depending on the person, time of day, and activity level.
The temperature of every person may not always be exactly 37.0°C, and factors such as age or health can influence body temperature.
Fahrenheit and Kelvin Scales
Fahrenheit Scale: Another unit of temperature measurement, commonly used in countries like the United States. The normal body temperature in Fahrenheit is about 98.6°F.
Kelvin Scale: Used in scientific contexts. The SI unit of temperature is Kelvin (K).
Conversion Formula: Temperature in Kelvin = Temperature in Celsius + 273.15
Additional Information
Clinical Thermometer Limitations: Clinical thermometers cannot be used to measure very high or very low temperatures, such as the temperature of boiling water or ice.
Pulse Rate as a Measure of Fever: Before thermometers were invented, people would check pulse rates to judge if someone had a fever. However, this is not a reliable method, as many factors besides fever can affect pulse rate.
Laboratory Thermometer
Laboratory thermometers are designed to measure higher temperatures compared to clinical thermometers.
It consists of a glass tube with a bulb at one end, filled with alcohol or mercury. When the thermometer is used, the liquid expands and rises, indicating the temperature on a calibrated Celsius scale.
Precautions: Handle the thermometer carefully as it is fragile. Do not hold it by the bulb, as this can affect the reading.
Correct Way of Measuring Temperature
Steps to use a laboratory thermometer:
The thermometer should be held vertically with the bulb fully immersed in the liquid.
It should not touch the sides or bottom of the container, and the reading should be taken with the eye level directly aligned with the top of the liquid column.
Measuring Temperature of Ice and Boiling Water
Two experimental setups:
one with ice and another with boiling water, where students compare the readings of the laboratory thermometer in each case.
Boiling water temperature: observe that the temperature remains constant at the boiling point while water is boiling.
Ice temperature: Similarly, the temperature remains constant at the freezing point while the ice is melting.
Air Temperature
Room Thermometer: Used to measure the temperature of the air or room, typically found in laboratories, clinics, or weather stations.
Know a Scientist:
Anna Mani
Anna Mani was a renowned Indian scientist, often referred to as the "Weather Woman of India." She invented and built weather instruments, significantly reducing India's reliance on foreign equipment. She also researched solar and wind energy, contributing greatly to India's renewable energy sector.
5 Important Topics of Class 6 Science Chapter 7 Temperature and its Measurement
Importance of Revision Notes for Class 6 Science Chapter 7 Temperature and its Measurement
Revision notes provide a clear and concise summary of the key concepts, making it easier for students to review the important points quickly before exams.
Complex topics like measuring temperature and understanding thermometers are simplified in the notes, helping students grasp difficult concepts more easily.
The notes focus on essential definitions such as temperature, thermometer, Celsius scale, and Fahrenheit scale, aiding students in memorising important scientific terms.
By highlighting the differences between clinical and laboratory thermometers, the notes ensure a better understanding of how each type is used.
The organised structure of the notes helps students stay focused on the main topics without feeling overwhelmed by unnecessary information.
Revision notes improve retention by reinforcing the core ideas, allowing students to recall information more easily during tests and exams.
They also serve as a quick reference for last-minute revisions, helping students cover all the necessary points without missing any critical details.
Revision notes support better exam preparation by summarising key facts, giving students more confidence in their understanding of the chapter.
Tips for Learning the Class 6 Chapter 7 Science Temperature and its Measurement
Begin by understanding the basic concept of temperature and its importance in measuring how hot or cold an object is.
Familiarise yourself with the different types of thermometers, such as clinical and laboratory thermometers, and their uses.
Pay close attention to how to handle thermometers carefully to avoid breaking them and to ensure accurate readings.
Practice using a clinical thermometer to measure body temperature by following the steps taught in the activity.
Learn how to read a laboratory thermometer by focusing on the position of the liquid column and how to align it with the scale.
Explore the difference between Celsius, Fahrenheit, and Kelvin temperature scales and how to convert between them.
Take part in practical activities, like measuring the temperature of boiling water or ice, to gain hands-on experience and solidify your understanding.
Conclusion
In this chapter, we learned about the concept of temperature and how it helps us understand whether an object is hot or cold. We explored the different types of thermometers used in daily life and laboratories. The importance of using these instruments correctly was highlighted through various activities. Understanding how to measure temperature using both clinical and laboratory thermometers allows us to gain practical skills that can be applied in real-world situations. Through simple experiments, we also understood the significance of accurate temperature readings and how they relate to our environment and health.
Related Study Materials for Science Class 6 Chapter 7 Temperature and its Measurement
Revision Notes Links For Class 6 Science Revision Notes
Related Study Material Links for Class 6 Science
FAQs on Temperature and its Measurement Class 6 Science Chapter 7 CBSE Notes - 2025-26
1. What is the main purpose of measuring temperature for a quick revision?
For a quick recap, the main purpose of measuring temperature is to determine the degree of hotness or coldness of an object. This is a crucial concept in science and has practical uses in daily life, such as checking for fever with a clinical thermometer or measuring the temperature of water in a science experiment with a laboratory thermometer.
2. How can you summarise the Celsius scale as a key concept?
The Celsius scale is a common unit for measuring temperature, denoted by °C. For revision, remember its two primary reference points: the freezing point of water is 0°C, and the boiling point of water is 100°C. This scale is used worldwide for most scientific and everyday temperature measurements.
3. What are the key differences to remember between a clinical and a laboratory thermometer?
To revise this topic effectively, focus on these two main differences:
- Temperature Range: A clinical thermometer has a short range, typically from 35°C to 42°C, to measure human body temperature. A laboratory thermometer has a much wider range, such as -10°C to 110°C, for experiments.
- Design Feature: A clinical thermometer has a kink or constriction in the tube just above the bulb. This prevents the mercury level from falling back immediately, allowing time for an accurate reading. Laboratory thermometers do not have this kink.
4. What is the normal human body temperature that a Class 6 student should remember?
The average normal temperature for the human body is 37°C (thirty-seven degrees Celsius). It is important to recall that this is an average value, and a slight variation is perfectly normal.
5. What are the most important precautions to recall when using a laboratory thermometer?
While revising, focus on these key rules for using a laboratory thermometer correctly:
- It should be kept upright, not tilted.
- The bulb should be fully surrounded by the substance whose temperature is being measured.
- Ensure the bulb does not touch the surface or bottom of the container.
- Hold it by the glass stem, not the bulb, as your body heat can alter the reading.
6. Why is there a kink in a clinical thermometer but not in a laboratory one?
The kink is a crucial design feature specific to clinical thermometers. Its purpose is to prevent the mercury level from dropping on its own after the thermometer is removed from a patient's body. This gives a person enough time to note the reading accurately. A laboratory thermometer does not need this feature because the temperature is read while its bulb is still in contact with the substance.
7. Why does the temperature of pure water not increase beyond 100°C when it is boiling?
This is a core concept to understand. Once water reaches its boiling point of 100°C, any additional heat energy is used to change its state from liquid to gas (steam). This energy is used for the change of state rather than increasing the temperature. Therefore, the temperature of boiling water remains constant at 100°C.
8. Could you use a laboratory thermometer to check for a fever? Why is this not a good idea?
No, a laboratory thermometer is not suitable for checking body temperature. The key reason is its lack of precision for this purpose. Its temperature range is very wide, so the degrees are marked much closer together. This makes it very difficult to read the small, critical variations in body temperature that signify a fever (e.g., distinguishing between 37.5°C and 38°C).
9. Apart from being a visible silver liquid, what property of mercury makes it suitable for thermometers?
A key property of mercury that makes it ideal for thermometers is its uniform rate of expansion and contraction. This means it expands by the same amount for each degree rise in temperature. This ensures that the markings on the thermometer scale can be evenly spaced, leading to accurate and reliable readings.
10. How does the concept of 'temperature' connect to 'heat'?
For revision, it's important to understand the connection: Temperature is a measure of how hot or cold an object is. Heat, on the other hand, is the form of energy that flows from a hotter object to a colder object. A difference in temperature between two objects is what causes this transfer of heat energy.
