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Hot tea in one hand, cold water in the other. This is hot. This is cold. But how hot? A hand cannot give a number.

This is Chapter 7, Temperature and its Measurement, in your NCERT book.

What you will learn

• A number for hot — a thermometer gives one number.
• Reading the scale — every mark is worth a fixed amount.
• Two thermometers — one for the body, one for experiments.
• Everyday numbers — weather and cold storage use the same number.

Need a quick recap?

• Hot, cold, or just used to it? (in Track Zero). Your hand is not a good thermometer.

Stay safe

Nothing here needs real heat or cold. Every thermometer stays on the screen.