# Heat Class 7 Science Notes - Chapter 4

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 3.

Have you ever experienced cold inside the house and warmth in the sun during winter? Also, feeling hot inside as well as outside the house in the summer season? To protect ourselves from the chilling cold, we wear clothes made of wool. These woollen clothes are obtained from wool-yielding animals such as sheep, goats, yack, etc. Wearing light-coloured clothes during summer will give us a feeling of coolness. To know if the object is hot or cold and the degree of its hotness, we will be studying this chapter. The measure of the intensity of heat present in a substance is called temperature. It is measured with the use of a device called a thermometer. There are two types of thermometers, viz. Laboratory thermometer and clinical thermometer. Below are a few differences between the two:

 Laboratory thermometer Clinical thermometer It is mainly used in labs for scientific purposes Used at hospitals, homes, etc. Wide range and accurate Short-range and Simple device

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## Few Important Questions

1. Why are stainless steel pans provided with copper bottoms? Explain.
2. What happens when one end of a wooden spoon is dipped in an ice cream cup?
3. Calculate and give the right answer: 1 litre of water at 30°C is added to 1 litre of water at 50°C. What is the temperature of the mixture?
4. Which colour of clothes absorbs more heat when compared to light colours?
5. What are conductors? Give one example.
6. What are insulators? Give an example.
7. Distinguish between the clinical thermometer and the laboratory thermometer.
8. How to determine the hotness of an object?

 Clinical Laboratory Thermometer Conductors Insulators

## Frequently Asked Questions on CBSE Class 7 Science Notes Chapter 4 Heat

Q1

### What are the uses of a thermometer?

A thermometer is a device which is mainly used for measuring temperature.

Q2

### What is stainless steel?

Steel is an alloy of iron and carbon. Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon and other alloying elements.

Q3

### What is the unit of intensity of heat?

Heat has the unit joule (J) in the International System of Units (SI).