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How can a object can stay in the air?

Updated: 9/15/2023
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14y ago

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An object stays in the air when the density of the object is at equilibrium with that of the air. A good example of this would be a light-weight, hollow container filled with 50% helium, and 50% oxygen. This would stay perfectly stationary, so long as there was enough helium to counteract the container's weight, in mid-air. However, if the helium level is greater than the air within the object, it will continue to float upward until the density of the object is equal to that of the atmosphere around it.

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Q: How can a object can stay in the air?
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