A Journey Through The States Of Water Chapter 8 Class 6th
A Journey Through The States Of Water
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.
Answer:
(iv) Condensation means the change of water vapour into liquid form. It often happens when warm air cools down.
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
Answer:
(i) (b) Water colours dry by evaporation.
(ii) (b) Ink from ink pens dries due to evaporation on the paper.
3. We see green coloured plastic grass at many places these days. Why does natural grass feel cooler than the space around plastic grass?
Answer:
Natural grass releases water through evaporation, which cools the air. Plastic grass does not evaporate water, so it feels warmer.
4. Give examples of liquids other than water that evaporate.
Answer:
Alcohol, petrol, nail polish remover, and perfume are some liquids that evaporate quickly when exposed to air.
5. Fans move air around, creating a cooling sensation in drying clothes. Explain.
Answer:
Fans speed up evaporation by moving air. Faster-moving air takes away moisture from wet clothes, helping them dry even in cooler air.
6. Often, when sludge is removed from drains, it is left in heaps. Explain how this helps.
Answer:
The sludge is left to dry. This reduces its weight, makes transport easier, and lowers the risk of spreading germs during handling.
7. Observe the activities in your house for a day. Identify the activities that involve evaporation.
Answer:
- Drying clothes
- Sweating while working
- Water drying from utensils
- Floor drying after mopping
- Boiling water in cooking
8. How does understanding the process of evaporation help us in our daily activities? How is water present in the solid state in nature?
Answer:
Evaporation helps in drying clothes, cooling our body through sweat, and preserving food. Water in its solid form is seen as ice, snow, and glaciers.
9. Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Answer:
- Water is very important for all living beings to survive.
- We must not waste water while bathing, brushing, or washing.
- Saving water helps others who do not get enough clean water.
- We should fix leaking taps and use buckets instead of pipes.
- It is our duty to protect water sources from getting dirty.
- Before asking for clean water, we must act to save and care for it.
10. The seat of a two-wheeler parked on a sunny day becomes very hot. How can you cool it down?
Answer:
Pouring water on the seat and letting it evaporate or covering it with a cloth can cool it down quickly.
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