Temperatures throughout the area this morning dropped well below zero. Robert Craigle, 19, from Hometown, a senior at Tamaqua High School, got up early with a few friends to try a popular exothermal process involving combining boiling water and very cold temperatures. Here Craigle carefully throws boiling water into the -2 degree air. As the boiling water leaves the measuring cup, a majority of the scattered water droplets freeze instantly on contact with the atmosphere. The smaller the droplets and the colder the air, the faster the freezing. Boiling water works much better as the water molecules at the surface of the droplet evaporate. This creates an enhanced cooling effect on the surface of the droplet, which makes it freeze more quickly. Water purity is also a factor, since ice crystals form around foreign particles, meaning the more impurities there are in the water the more ice crystals there will be.