A Journey through States of Water Class 6 (Curiosity)

(Page 161) 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.
This is the best description of condensation.

(Page 161) 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 Evaporation is very important in:
(b) water colours
Because water needs to evaporate for the paint to dry.

(Page 161) Identify in which of the given processes, evaporation is very important- (ii) Writing on paper with (a) pencil (b) ink pen (c) ball point penEvaporation is very important in:
(b) ink pen
Ink from an ink pen dries mainly because the ink is liquid and it evaporates.

(Page 161) 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
Natural grass has water in it which evaporates .This absorbs heat and cools the surroundings
Plastic grass
Plastic grass has no water, There is no evaporation in it so it doesn’t cool the surroundings

(Page 161) Give examples of liquids other than water that evaporate. Examples of liquids other than water that evaporate are :-
Perfume
Nail polish remover
Alcohol
Petrol
Kerosene
These can all turn into vapour on their own.

(Page 161) Fans move air around, creating a cooling sensation. It might seem strange to use a fan to dry wet clothes since fans usually make things cooler, not warmer. Normally, when water evaporates, it requires heat, not cold air. What do you think about this?Fan brings dry air towards clothes and pushes wet air away
This makes the water evaporate faster, so the clothes dry quickly - even without heat.

(Page 161 and 162) Usually, when sludge is removed from drains, it is left in heaps next to the drain for 3–4 days. Afterward, it is transported to a garden or a field where it can be used as manure. This approach reduces transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how. Question 6 (Page 161 and 162) Usually, when sludge is removed from drains, it is left in heaps next to the drain for 3–4 days. Afterward, it is transported to a garden or a field where it can be used as manure. This approach reduces transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how. Aspect Sludge Moved Immediately (Wet Sludge) Sludge Left for 3-4 Days (Dried Sludge)
Water content Very high (full of dirty water) Extra water drains out
Weight Very heavy Much lighter
Number of workers needed More workers required Fewer workers needed
Transportation cost High cost Lower cost
Ease of handling Difficult to handle Easier to handle
Use as manure Not suitable immediately Can be safely used as manure in fields/gardens

(Page 161 and 162) Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities?Wet clothes become dry
due to evaporation
Wet Floor gets dry
due to evaporation
Question 7 (Page 161 and 162) Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities?Question 7 (Page 161 and 162) Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities?If we heat Water,
its quantity reduces due to evaporation

(Page 162) How is water present in the solid state in nature?Water is present in solid state in nature as ice. You can see it in several natural forms :
Iceberg
Snow on Mountains
FrostGlaciers
All these are examples of water in its solid form.

(Page 162) Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.Most of Earth’s water is salty and cannot be used for drinking. Example - Water in Ocean, Seas.
Fresh water available for use is very limited on Earth.
Wasting water can lead to water shortage in the future.
So, Water is our responsibility and we should use it judicially

(Page 162) The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?Pour or sprinkle water on the seat (fastest cooling method) Water absorbs heat from the seat.
2. Cover the seat with a cloth soaked in water Evaporation cools surfaces when water evaporates, it takes heat away.
3. Move the bike into shade (slower, but no water needed) Shade reduces heat from sunlight, allowing the seat to lose
heat naturally.