Advertisements
Advertisements
प्रश्न
Observe how much water is used and for what purposes it is used in your house for a whole day. Record it in a chart like the one shown here. Discuss this data in the class. Divide the total amount of water used in your house by the number of persons to find out how much water each person needs.
You will see that it is almost impossible for us to spend even a single day without water. We need to drink three to four litres of water every day so that all our bodily functions run smoothly. Other living things also require water, although the amount of water they need may vary according to the size of their body. Thus, we see that water is very important.
If hydrogen gas burns in air, it combines with oxygen and water is formed. We have learnt about some characteristics of water in the previous standards.
| Purpose for which water is used |
Amount of Water (approx.) in litres |
| Bath | |
| Brushing teeth | |
| Washing clothes and utensils | |
| Mopping the floor | |
| Drinking | |
| Cooking | |
| Total use of water |
Advertisements
उत्तर
| Purpose for which water is used |
Amount of Water (approx.) in litres |
| Bath | 50 litres |
| Brushing teeth | 1 litre |
| Washing clothes and utensils | 75 litres |
| Mopping the floor | 10 litres |
| Drinking | 8 litres |
| Cooking | 6 litres |
| Total use of water | 150 litres |
Total number of persons = 3
Total water used per person = `150/3 = 50` litres.
Approximately 50 litres of water is required for 1 person.
