A Journey through | Class 6 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 3 min read
A Journey through – this guide gives you a concise, exam-ready overview of A Journey through from Class 6 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Another Mystery
This section investigates the appearance of water droplets on the outer surface of a glass tumbler containing cold water and ice cubes. Aavi and Thirav observe that tiny water droplets form on the outside of the glass after some time. Students are encouraged to perform a similar experiment by adding ice cubes to cold water in a glass and observing the outer surface. Various hypotheses are discussed, such as water seeping out of the glass or condensation of water vapour from the air. The section explains that water vapour in the air condenses on the cold surface of the glass, forming droplets. This process is called condensation. An activity involving weighing the glass with ice water on a digital balance is described to investigate whether water is seeping out or condensation is responsible for the droplets. The section also introduces the concept of humidity—the amount of water vapour in the air—and relates it to everyday observations like dew on plants and water droplets on cooking utensils.
📊 Diagram: Figures show a glass tumbler with ice cubes and water droplets on the outer surface, dew drops on plants, and a chain of reasoning illustrations debating seepage versus condensation.
🧪 Activity: Activity 8.3: Add ice cubes to cold water in a glass and observe water droplets on the outer surface. Activity 8.4: Weigh the glass with ice water and cover with a steel plate to study condensation and seepage.
🔗 Connection: Prepares for the next section explaining the different states of water and their properties.
Frequently asked questions
1. Which of the following best describes condensation? (i) The conversion of water into its vapour state. (ii) The process of water changing from a liquid into gaseous state. (iii) The formation of clouds from tiny water droplets. (iv) The conversion of water vapour into its liquid state.
The correct answer is (iv) The conversion of water vapour into its liquid state. Condensation is the process where water vapour in the air cools down and changes back into liquid water, forming droplets such as clouds.
2. Identify in which of the given processes, evaporation is very important— (i) Colouring with (a) crayons (b) water colours (c) acrylic colours (d) pencil colours (ii) Writing on paper with (a) pencil (b) ink pen (c) ball point pen
Evaporation is important in: (i) Colouring with (b) water colours and (c) acrylic colours because the liquid part of the colours evaporates to leave the colour on paper. (ii) Writing on paper with (b) ink pen and (c) ball point pen because the ink dries by evaporation of the solvent.
3. We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?
Natural grass feels cooler because it contains water which evaporates, causing cooling. Plastic grass does not have water and hence no evaporation occurs, so it does not cool the surrounding air.
4. Give examples of liquids other than water that evaporate.
Examples of liquids other than water that evaporate include alcohol, petrol, kerosene, acetone, and cooking oil.
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