ocr: Why do some things float? An object will float in air if it has less mass than the same volume of air. A hot-air balloon floats because hot air has a lower density than cold air. A burner 1S used to heat the air inside a hot-air balloon until the airs density is low enough for the whole balloon to float upward. This is known as Archimedes principle, and it doesn't onlya applyt to air. A ship floats on water because it is less dense than the water it displaces; an anchor sinks because it 1S more dense. You can find the density of something by dividing its mass byi its volume. Mass Density Volum ...
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