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.

Last Updated: September 23, 2026

• 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.

Frequently Asked Questions

What are the three main modes of heat transfer covered in this chapter?
Heat can transfer through conduction, which occurs through direct contact in solids, convection, which occurs through the movement of fluids, and radiation, which occurs through electromagnetic waves without needing any medium.

Why can radiation transfer heat through the vacuum of space while conduction and convection cannot?
Conduction and convection both require particles of a medium to transfer heat, whereas radiation travels as electromagnetic waves that do not need any particles, which is how heat from the sun reaches Earth.

Written by Satish

NCERTBooks.org is an independent educational resource run by a small team focused on making official NCERT textbooks easy to find, read, and download for students, parents, and teachers across India. We are not affiliated with NCERT or the Ministry of Education -- we organise publicly available NCERT content by class and subject, verify links against official sources, and build tools (like our in-browser reader) that make studying more convenient. Every guide we publish is written and reviewed by our team based on the actual NCERT curriculum and syllabus.