It is infrequent that such a simple yet perplexing project like this one comes along.     Here's all you have to do: sprinkle a few water droplets onto a new teflon cookie sheet. Turn it over. The bigger drops fall, but the smaller ones stick to the teflon! But what holds them on? Force = mass / area of contact   Other things to do: measure the force try oil, wax, instead of teflon vary the liquid stay in contact with this website.*     Some big words may fit into this somewhere: hydrophobic, adhesion, van der Walls forces, ionic bonds, hydrophilic, or a totally new force! * For more details: www.science-projects.com/Teflon.htm