An aluminum sphere (specific gravity 2.7) falling through water reaches a terminal speed of 4.4 cm/sWhat is the terminal speed of an air bubble of the same radius rising through water? Assume viscous drag in both cases and ignore the possibility of changes in size or shape of the air bubble; the temperature is 20°C where air density is 1.20 kg/m3 and water density is 1001.80 kg/m3.
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I answered almost exactly the same question from someone called Dana an hour or two ago (though the speed was 3.1cm/s not 4.4cm/s)See link.
