Perform this experiment only under adult supervision in a well-ventilated area.
Reagents and equipment
water-resistant shoe polish;
Pour some fine sand into a glass container and treat it with water-resistant shoe polish. Mix thoroughly. Leave the sand to dry for two days, stirring occasionally.Your cool hydrophobic sand is ready!
Shoe polish contains substances that are "scared” of water. Such substances are called hydrophobic. They repel water and prevent the sand from getting wet. When you pour the treated sand into water, a layer of air forms between them. This allows the sand to remain dry and loose.
Dozens of experiments you can do at home
One of the most exciting and ambitious home-chemistry educational projects