Charles law states that if the volume of a gas is kept constant, the p

1.	Charles law states that if the volume of a gas is kept constant, the pressure of the gas is directly proportional to temp. This implies that in an ideal situation where the vol. does not change, if either the pressure or the temp. is increased, the other one will increase in the same proportion . This aspect has a no. of applications in our everyday life. Now answer the following questions: (i) When we use a pressure deodorant can for a few seconds, the can tends to become cooler.Why? (ii) When the ping pong ball, a toy of the children, gets dented without being punctured, what do we do to regain the original shape and why? (iii) Beer or soda cans and bottles have a label on them stating ‘Store in cool,dry place’.Why? (iv) Inflated football gets deflated in winter. Why? (v) Why hot air is filled in the balloons for metrological observations?
Answer» (i) When we spray the can, the liquid spray of the can is released. Hence, pressure inside decreases a bit. Since the can‘s volume does not change, the temp. falls. (ii) We place the dented ping pong ball in warm water. As temp.inside increases, the pressure inside increases. As a result, dent gets removed. (iii) The reason is that these cans have a lot of artificial pressure stored in them. When exposed to direct heat, the pressure inside the cans rises because vol. remains constant. When the pressure exceeds the certain limit, the can explodes. (iv) When the ball is brought outside, the temp. dropped. As a result, the pressure of the air inside the football also dropped making the ball look deflated. (v) Air expands on heating. Hence, its density decreases. Thus, hot air is lighter than atmospheric air. This helps the balloon rise up.

Charles law states that if the volume of a gas is kept constant, the pressure of the gas is directly proportional to temp. This implies that in an ideal situation where the vol. does not change, if either the pressure or the temp. is increased, the other one will increase in the same proportion . This aspect has a no. of applications in our everyday life. Now answer the following questions: (i) When we use a pressure deodorant can for a few seconds, the can tends to become cooler.Why? (ii) When the ping pong ball, a toy of the children, gets dented without being punctured, what do we do to regain the original shape and why? (iii) Beer or soda cans and bottles have a label on them stating ‘Store in cool,dry place’.Why? (iv) Inflated football gets deflated in winter. Why? (v) Why hot air is filled in the balloons for metrological observations?

Answer»

(i) When we spray the can, the liquid spray of the can is released. Hence, pressure inside decreases a bit. Since the can‘s volume does not change, the temp. falls.

(ii) We place the dented ping pong ball in warm water. As temp.inside increases, the pressure inside increases. As a result, dent gets removed.

(iii) The reason is that these cans have a lot of artificial pressure stored in them. When exposed to direct heat, the pressure inside the cans rises because vol. remains constant. When the pressure exceeds the certain limit, the can explodes.

(iv) When the ball is brought outside, the temp. dropped. As a result, the pressure of the air inside the football also dropped making the ball look deflated.

(v) Air expands on heating. Hence, its density decreases. Thus, hot air is lighter than atmospheric air. This helps the balloon rise up.

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