Alrighty, so, when water is heated it begins to evaporate which creates a sort of mist. When the hot water was put into the convection tube then the water began to evaporate forming moisture inside the tube as the water vapor began to join back together into water. A cloud is formed in the same way. Water from various water sources evaporates and lifts into the sky, they then pull together and form clouds, inside these clouds the water droplets get bigger and bigger until the cloud is unable to hold anymore water and that's how rain happens. Once the cloud is heavy enough the water pours out of it and WALLA rain! Hope this helps!
