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← Temperature and its Measurement

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Lesson 8 of 9

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7 min

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A table of all six ideas first. Then the quiz.

Temperature and its Measurement — the six rules, before the quiz
IdeaThe rule
A number for hotWarmed liquid expands and climbs the tube on its own.
Reading the scaleDifference between two labels, divided by the gaps, is one mark's worth.
The clinical thermometerRange about 35 °C to 42 °C. A kink holds the reading until it is shaken.
The laboratory thermometerRange about −10 °C to 110 °C. The range decides what it reads.
Using it wellBulb fully in. Wait to read. Keep away from flames. Tell an adult if it breaks.
Everyday temperaturesSubtract the smaller from the bigger. Count up across zero first.

What happens inside a thermometer when it warms?

  • Air pushes the liquid up the tube
  • The liquid expands and climbs
  • The tube gets longer

A scale is labelled 10 °C and 20 °C. It has 5 gaps between them. What is one mark worth?

  • 5 °C
  • 2 °C
  • 10 °C

A clinical thermometer is taken out of the mouth. What does the reading do?

  • It falls back at once
  • It stays at the highest point
  • It keeps rising

Can a clinical thermometer read 80 °C tea?

  • Yes, it reads 80 °C
  • No, 80 °C is off its scale
  • Yes, it reads 42 °C exactly

Why must the bulb sit fully inside the water?

  • To make the glass heavier
  • So it measures the water, not the air
  • To keep the water still

A glass thermometer breaks. What should you do?

  • Pick up the pieces
  • Tell an adult
  • Say nothing

A freezer reads −5 °C. A room reads 15 °C. What is the difference?

  • 10 °C
  • 20 °C
  • 15 °C

Read Chapter 7 in your NCERT book. Next: A Journey through States of Water. See what happens as water warms and cools.

Reveal every answer to finish this lesson.