What does"float away" mean exactly in below sentence?and what simple word can we use instead of it?

"Astronauts eat with spoon.It is a good idea to have food with sauce so that it stays on the spoon and doesn't float away!"

Thanks for your answer!

Vidreneh"float away"

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May someone answer ?

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May someone answer ?

Don't be impatient. You posted in the evening (my time) yesterday. I went to bed before I saw your post. I do not answer when I am asleep.

 AlpheccaStars's reply was promoted to an answer.