why does a coin sink in water

HDPE (high density polyethylene), LDPE (low density polyethylene), and PP (polypropylene) which make up containers and plastic bags for example do float, as their density is less than that water. Higher density plastics such as PET (polyethylene terephthalate), PVC (polyvinyl chloride), and PS (polystyrene solid), do sink. Show the Sink and Float chart to the children during group time. Ask what they already know about things that sink and things that float. What do they think will happen if they put paper items in water? Provide the children with various paper materials. Encourage them to place the materials into the