# Thread: What is the fastest that a mass of air can rise underwater?

1. What is the fastest that a mass of air can rise underwater?

Also, how fast will 300 kg of air accelerate upwards when it displaces about 30,000 kg of water? What is the total net force?

2.

3. newton's law of gravity will be the fastest possible... 9,8 meters/s/s

4. Originally Posted by benonthego
What is the fastest that a mass of air can rise underwater?

Also, how fast will 300 kg of air accelerate upwards when it displaces about 30,000 kg of water? What is the total net force?
Well, the question put in one line is: "What is the terminal velocity of a bubble of air under water?"

Terminal velocity depends on the co-efficient of viscosity (here, of water), the difference in densities of the moving object (air bubble) and the medium (water), and finally, the shape and size of the bubble.

U must get the exact formula in any high school text-book.

As of the second question, the force is Net buyoancy minus the weight of the bubble. It depends on how deep the bubble is underwater, since depth effects the volume, and hence, density of the bubble.

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