Makes 3 Gallons of Instant Snow! Just add tap water. Stays cold and feels just l ike real snow! What's not to love? Insta-Snow turns ordinary water into a white fluffy substance that looks like real snow. No stirring, no mixing, tons of science fun. Absorbs up to 100 times it's weight in water and fluffs up to way over 3 gallons. This educational toy includes an activity guide that explains the science behind the faux snow. What is S.T.E.M.? STEM stands for Science, Technology, Engineering, and Math, which constitutes many of the areas educators look to cover for science based activities. We are proud to say that his kit has a strong focus on STEM.