This question concerns the density (that is, the mass per unit-volume) of water vs sand. Pure water is a precise substance, the density of which is, by definition, 1000kg/m… 3 , which means 1 litre (0.001m 3 ) of water weighs 1000grams (1kg). Sand is a non-uniform material, that can exist at different densities depending on the type of sand, the compactness and whether or not the sand is wet. As a rough guide, the weight of a litre of sand under the following conditions is given: .
Sand, wet, packed .
From these quantities, we can see that in all cases, sand is heavier than water. ( Full Answer )