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why does cut lemon float but cut lime sink ? Answered

Working in a bar I was cutting up fruit to go in the drinks. We always put it in soda water to keep it moist but last night i noticed that the lemon slices floated but the lime sank, why ?

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I believe it has something to do with the amount of pith(the white part under the skin)on a lemon compared to a lime. Lemons generally have a lot more pith than limes, and given the spongy quality of pith, it would certainly improve the buoyancy of lemons.

They're not floating they're swimming.  Everyone knows limes can't swim.

Ever heard of "density"?

As both are fluid-filled sour citrus fruits, it's not quite so simple. I'd say that the skin is thicker on a lemon, and it's that that contributes to overall buoyancy. Gas-lifting may have an effect (in soda water), but I wouldn't like to comment on that without running a test.

L