The Little Mermaid (1989)

"She wants to be where the people are. So Ariel, The Little Mermaid herself, makes a deal to gain legs and lose her voice, just so she can go above the sea and fall in love with Prince Eric. Complications, often involving charades, ensue. But why didn’t she write on a piece of paper to Eric about what was going on? After all, we see her write in English earlier when she signs her name for the deal. Fans asked animators this question at an event. The animators just smiled and said, “Next question.”"
It’s about BUOYANCY!
I agree - Rose would have floated if she was the one in the water. ????
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