Pressure in Air
Pressure in Air
Pressure in Air:
Buoyancy in gas acts in the same way as that in a liquid. Objects in a liquid are buoyed upward because the pressure acting up against the bottom of the object exceeds the pressure acting down against the top. Likewise air pressure acting up against an object immersed in air is greater than the pressure above pushing down. The buoyancy in both cases is numerically equal to the weight of fluid displaced. Archimedes principle applies to air just as it does for liquid: When an object is wholly or partially immersed in a gas it loses some of its weight which is equal to the weight of the displaced gas.
Example: How does buoyancy change as a helium filled balloon ascends?
Solution : If the balloon is free to expand as it rises, the increase in volume is counteracted by a decrease in the density of higher-altitude air. So. interestingly, the greater volume of displaced air does'nt weigh more, and buoyancy stays the same. If a balloon is not free to expand. buoyancy will decrease as the balloon rises because of the lesser density of the displaced air. Usually, balloons initially expand when they rise, and, if they dont eventually rupture, fabric stretching reaches a maximum and the balloons settle where buoyancy matches their weight.
Which of the following are correct : (a) When an object is wholly or partially immersed in a gas it loses some of its weight which is equal to the weight of the displaced gas. (b) When an object is wholly or partially immersed in a gas it loses some of its weight which is more than the weight of the displaced gas. (c) Sufficient air for breathing is present only up to about 15 km above the Earth. | |||
| Right Option : C | |||
| View Explanation | |||
Objects in a liquid are buoyed _____________________ because the pressure acting up against the bottom of the object exceeds the pressure acting down against the top. | |||
| Right Option : A | |||
| View Explanation | |||
As we go higher up on mountains our ears pop because | |||
| Right Option : C | |||
| View Explanation |
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8thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
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