Why do whole oranges float, but peeled oranges sink?

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Here is the original QI tweet:
"A whole orange will float on water, but a peeled orange will sink."
https://twitter.com/qikipedia/status/970177018561286144

Orange: 246.3g
Peel: 97.9g

Orange displacement: 231.2g
Peel displacement: 109.4g

Total Orange: 344.2g
Total displacement: 340.6g

If you make your own measurements with an orange: send them in to me! matt@standupmaths.com


CORRECTIONS
- None yet. Let me know if you spot anything!

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MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/
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