It is flat at one end and round at the other. It smells like peppermint. It has a bump on it. I hope it is candy. Ken put a thermometer in a glass filled with hot water.
Gravity pushes it up.
Air bubbles are released. Heat from the water makes it expand. Air pressure above the water pulls it up. Some children were trying to find out which of three light bulbs was brightest. One bulb looks brightest to me, so I already know the answer.