Why free-floating plant leaves can float on water?

25-06-2006, 04:49 AM posted to rec.aquaria.freshwater.plants

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Why free-floating plant leaves can float on water?

For free-floating and floated-leaf plant, I know air is trapped and
density is lower than water.
People told me:" upper leaf surface is hydrophobic and unwettable (so
it floats); and lower surface is hydrophilic". Is that true? I want to
find books or papers to verifiy this.
Thanks a lot.

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