All water, ice and water vapor is made of H20 molecules which contain empty space and are surrounded by empty space. Size of Water Molecules Water molecules are similar to cells or dust specks. Water molecules can be seen with microscopes.
Water molecules are too small to see even with the most powerful microscope.
States of Water Water molecules share properties with observable states of matter. Thus water molecules in liquid form are thought of as liquid themselves. The molecules do not change, but the interactions between them do. In liquids like water, molecules move freely, slipping and sliding past one another. At the same time, the molecules bind together and the substance takes on the shape of its container, seeking the lowest level.