Question

1)A drop of blue ink put into the water turns the water into blue colour.why?

2)gasae diffuse fast.why?

3)In villages people often sprinkle water on the roof during summer in the evening.why ?

4)wet clothes dry up more quickly on a windy day.why?

5)evapourisatin produces cooling.why ?

6)why peple sweat a lot in humid weather ?

7)if a bottle of ammonia is kept opened in a corner of a laboratary,its smell can be felt in the whole room.why ?

8)pottasim permagnete crystells put in hot water mixes faster than in cold water.why?

9)aquatic animals can breathe under water.give reason .

plz friends answer these question as far as possible .





5)evapourisation produces cooling.why?

6)why people sweat a lot in humid

Answer 1

2. gases diffuse fast because the molecules in them are packed very loosely.

9. oxygen is the only element that we breathe. oxygen is also dissolved in water. aquatic animals have specialised structures called blowholes and gills. these take in water but take oxygen to body and release the rest. humans don't have those so we can't breathe underwater. due to these aquatic animals breathe.

5. evaporation
evaporation cools because, when water starts evaporating it takes all the heat around