The ability of the creatures of the sea to float is usually taken for granted, but to keep from sinking they must either keep swimming or be equipped with special flotation devices ...

Yeah, but why does wood float? There are two forces acting on the life jacket - its weight and the force of the water pushing upwards on it - the upthrust. And if the weight is equal to or less ...

Yeah, but why does wood float? There are two forces acting on the life jacket - its weight and the force of the water pushing upwards on it - the upthrust. And if the weight is equal to or less ...