Question

5. Vу ППСІ talang (b) Alum purification? (a) Fertilizer B. State whether the following statements are true (T) or 1. Air exerts pressure always in the upward direction. 2. Plants cannot use nitrogen directly from the atmosphere. 3. Stratosphere is the coldest among all the atmospheric layers. 4. Soluble impurities do not dissolve in water. 5. Decanted water is the purest form of water. blanks with the correct words. for rusting. (Water vapou​

Answer 1

Answer:

The envelope of air surrounding the earth is called atmosphere. Air has weight. The weight of air presses our bodies all the time. This weight of air acting on a surface causes air pressure. Air pressure can be understood with the help of certain activities.

Browse more Topics under Winds Storms And Cyclones

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Activity I

Materials Required: tumbler, water, square cardboard piece

Method: Fill up the tumbler with water up to the brim. Cover it with cardboard piece and turn the glass upside down. Slowly remove your hand.

Observation: Cardboard does not fall and water stays in the glass.

Inference: air pushes the cardboard up and prevents it from falling.

Activity II

Materials Required: plastic bottle with cap, hot water, cold water

Method: Pour hot water into the plastic bottle. Empty the bottle and put the cap tightly. Pour some ice-cold water on it.