Why do marshmellows float?

The answer to why marshmallows float is due to their density and surface tension. Marshmallows are made of a mixture of air, sugar, and gelatin. The air bubbles inside the marshmallow make it less dense than water, so it floats on the surface. Additionally, the surface tension of the water is higher than the surface tension of the marshmallow, which helps to keep it afloat.