Apples float in water because they are about a quarter air.
Around 25% of an apple is made up of tiny air pockets, which makes it light enough to float. That's exactly why the game of 'apple bobbing' works.
More facts about Fruits
Watermelon is mostly water, which is why it is so juicy.
Oranges are full of vitamin C, which helps keep you healthy.
Grapes can be dried in the sun to become raisins.
A lemon tastes very sour and can make your face scrunch up.
Dragon fruit has bright pink skin and white insides with tiny black seeds.