Why do orange slices sink in water, but lemon slices float?

Because the rind is incredibly porous and loaded with tiny pockets of air, the unpeeled orange floats. Despite the fact that peeling the orange removes bulk, the peeled orange is more thick and sinks into the water. A lime contains 88.26 percent water by weight, whereas a lemon is 87.4 percent, according to the USDA website.