Revision Notes for Class 7 Science Chapter 7: Heat Transfer in Nature

Quick revision notes summarizing all key concepts from Class 7 Science Chapter 7 “Heat Transfer in Nature”. These Class 7 Science Chapter 7 notes are ideal for quick revision just before exams.

• There are three modes of heat transfer: conduction (in solids, heat passes particle-to-particle without particle movement), convection (in liquids/gases, heated particles physically move and carry heat with them), and radiation (heat transfer without any medium, e.g., heat from the Sun or a fire).
• Good conductors of heat: steel, aluminium, most metals. Poor conductors (insulators): wood, plastic, bakelite, air.
• Hot air/liquid becomes lighter and rises; cooler, denser air/liquid sinks to take its place — this circulating movement is convection.
• Trapped air (in hollow bricks, double-walled containers, woollen clothes) acts as an insulator, reducing heat transfer.
• Sea breeze: during the day, land heats faster than sea, so cooler air flows from sea to land. Land breeze: at night, land cools faster than sea, so cooler air flows from land to sea.
• Water bodies moderate nearby temperatures because water heats and cools more slowly than land.
• Infiltration is the process by which water seeps through soil and porous rock into the ground; water gets stored in aquifers (rock/sediment layers with pore spaces).
• Seepage rate depends on particle size: gravel (largest particles/pores) allows the fastest seepage, followed by sand, then clay (slowest).
• The water cycle (evaporation → condensation → precipitation) continuously redistributes and replenishes water across the Earth.
• Darker surfaces absorb radiant heat more than lighter surfaces, which reflect more of it.

NCERT Solutions: Class 7 Science Chapter 7
Extra Questions: Class 7 Science Chapter 7

For the full chapter, see the Class 7 Science book page and the Class 7 Science Formulas Handbook.

Written by Satish

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