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## Main Question or Discussion Point

Hi,

I have a question about a rising bubble.

I read that the initial acceleration of a bubble (with negligible mass) in water is 2g, where g is the gravitational acceleration. I understand that if a bubble rise then the water move around it, but I can't derive this equation.

Could someone help me out?

I have a question about a rising bubble.

I read that the initial acceleration of a bubble (with negligible mass) in water is 2g, where g is the gravitational acceleration. I understand that if a bubble rise then the water move around it, but I can't derive this equation.

Could someone help me out?