Class 7 Science — Chapter 7: Heat Transfer in Nature

What you'll learn

• ▸Heat Transfer by Conduction
• ▸Conductors and Insulators
• ▸Practical Applications of Insulators
• ▸Heat Transfer by Convection
• ▸Convection in Air
• ▸Convection in Water
• ▸Land and Sea Breeze

Chapter Summary

--- PAGE 1 --- 7 Heat Transfer in Nature Pema and her brother Palden reside in Gangtok. On a cold winter evening, they are sitting around a fireplace. Palden shares his experiences of visiting Kerala during the winter vacation. He says that compared to Gangtok, winter in Kerala is comparatively warm and humid. Both Pema and Palden are curious about why some places are so cold and others quite hot. Hearing them express their curiosity, their grandfather, a retired science teacher, says, “Kerala is closer to the equator than Sikkim and it also has a long coastline, which results in warmer and more humid weather conditions”. Palden replies, “Yes, we learnt in Grade 6 Science and Social Science that for us on the Earth, the Sun is the main source of heat and light, and around the equator, the climate is generally hot”. As they are talking, Pema is keenly observing her grandmother cooking thukpa (a traditional Sikkimese dish) in a large metal pan. Pema asks, “Why are cooking utensils gen…

Practice Questions from this Chapter

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1. Show me more heat transfer examples. Get Solution →
2. Name five common insulators. Get Solution →
3. Explain why metals feel cold. Get Solution →
4. What is the process of heat transfer from the hotter part of an object to the colder part called? Get Solution →
5. Which of the following materials is a good conductor of heat? Get Solution →
6. What is the primary mode of heat transfer that causes smoke from a fire to rise? Get Solution →
7. How does heat from the Sun reach the Earth? Get Solution →
8. The movement of cooler air from the sea towards the land during the day is called what? Get Solution →

Did you know?

• 💡 Polar bear fur traps air, acting as an amazing insulator against Arctic cold.
• 💡 Hot air balloons float by heating air, using the same convection as rising smoke.
• 💡 Diamond is Earth's best natural heat conductor, far surpassing most metals.
• 💡 Igloos keep warm because packed snow is a fantastic natural insulator.
• 💡 Astronauts wear suits with many layers to control heat in outer space.

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