Class 7 Science Curiosity Chapter 7 Heat Transfer in Nature, explores how heat travels through different materials and environments. The Sun is the primary source of heat for our planet, and it affects everything — from weather patterns to the water cycle, from warming houses to drying clothes.
Heat is an essential form of energy that we experience in our everyday life — whether it’s feeling the warmth of sunlight, boiling water to make tea, or using a heater on a cold winter night. But have you ever wondered how heat actually moves from one place to another?
In this chapter we will learn about three main processes of heat transfer:
- Conduction – how heat moves through solids like metals.
- Convection – how heat flows through liquids and gases like water and air.
- Radiation – how heat reaches us directly from a hot object like the Sun or a fire, even without any contact or medium.
Heat Transfer in Nature Worksheet
Here we explore how heat moves in nature through three key processes — conduction, convection, and radiation. We also examine the role of heat in daily life, the water cycle, and how groundwater is formed and stored. Real-life examples like sea breeze, warm clothes, heating water, and even ice stupas help us understand these natural phenomena.
Also download:
Class 7 Science Worksheet Curiosity
Class 7th Science NCERT Solutions Curiosity
- S Gupta & New Age Editorial Team
Class 7 Science Curiosity Chapter 7 Notes
Conduction
- Heat transfer in solids.
- Particles do not move; they only transfer heat.
- Metals are good conductors (e.g., steel, copper).
- Wood, glass, air are poor conductors or insulators.
Convection
- Transfer of heat in liquids and gases by movement of particles.
- Hot fluids rise, cool ones sink — setting up a convection current.
- Examples: Boiling water, smoke rising, sea and land breeze.
Radiation
- Heat transfer without any medium.
- Sun’s heat reaches Earth by radiation.
- Dark surfaces absorb more heat; light ones reflect it.
Applications in Daily Life
Cooking utensils use metals for better conduction.
Woolen clothes trap air (an insulator) to keep warm.
Hollow bricks and mud walls used in extreme climates.
Water Cycle
- Steps: Evaporation, Transpiration, Condensation, Precipitation, Infiltration, and Storage.
- Maintains balance of water in nature.
Groundwater and Aquifers
- Water seeps into the ground (infiltration) and collects in aquifers.
- Gravel allows faster seepage than clay.
Heat Transfer in Nature Question Answer
Q1: How does the Sun help in the water cycle?
Ans: The Sun heats up water in oceans, rivers, and lakes, causing it to evaporate into water vapor. This is the starting point of the water cycle.
Q2: Why are cooking utensils made of metals?
Ans: Metals are good conductors of heat, so they allow heat to pass quickly and evenly, making cooking more efficient.
Q3: What happens when air or water is heated?
Ans: When air or water is heated, it expands, becomes lighter, and rises. Cooler particles move in to take their place, creating a convection current.
Q4: Explain why tea remains hot in a porcelain cup for longer time.
Ans: Porcelain is a poor conductor of heat, so it does not allow heat to escape quickly, keeping the tea hot for a longer time.
Q5: What is radiation? Give one real-life example.
Ans: Radiation is the transfer of heat without a medium.
Example: We feel the Sun’s heat even though space has no air.
Class 7 Science Chapter 7 Fill in the Blanks
- Heat transfer in solids takes place by ____.
- Woolen clothes keep us warm by____________ air.
- The __ is the main source of heat and light on Earth.
- Sea breeze blows from the ____ during the day.
- The process of water soaking into the ground is called________________.
- Materials like glass and wood are ____ of heat.
- ____ does not need any medium to transfer heat.
- ____ are layers of rocks that store groundwater.
Heat Transfer in Nature MCQs
Q1. Which of the following is a good conductor of heat?
(a) Wood
(b) Plastic
(c) Copper
(d) Glass
Q2. In which form does the Sun transfer heat to Earth?
(a) Conduction
(b) Radiation
(c) Convection
(d) Evaporation
Q3. Which material will allow water to seep through the fastest?
(a) Clay
(b) Sand
(c) Gravel
(d) Cement
Q4. Which of the following is NOT an example of convection?
(a) Sea breeze
(b) Land breeze
(c) Heating water in a pot
(d) Feeling warm near a heater
Q5. What is the process of water soaking into soil called?
(a) Condensation
(b) Evaporation
(c) Precipitation
(d) Infiltration
Q6. What type of heat transfer takes place in solids?
(a) Radiation
(b) Convection
(c) Conduction
(d) Reflection