Penny lab-Waters Properties

I did this penny lab by first collecting the materials of a penny, a cup of water, and a water dropper. I layed the penny on a paper towel then applied droplets of water from the water dropper on the penny and recorded how many drops it took for the water to overflow over the penny. I predicted it would take 3 drops of water but i was way off! I soon discovered it took 12 drops of water for the overflowing to occur. this happened because all the water molecules stick together and create an even bigger molecule which causes it to overflow.