science+discoveries+of+December+mep

12-10-14 Why Does Candle Wax Melt? Wax is naturally a solid, but when heat is added it becomes a liquid and gas at the same time. this is called Phase Change. Phase Change is when one state of matter turns into another when added heat or removing heat. Is this a Physical or Chemical Change? this would be a physical change. When wax is heated, it doesn't always stay in a liquid form. it eventually gets cooled and it hardens back into a candle. Why does it melt? Candle wax is inflammable and can handle fire without it catching on fire. the wax melts instead of bursting into flames.

12-22-14 what causes head aches? Headaches are caused usually by over activity from pain-sensitive structures in your head. the common type of head pains are the tension type head aches. a wide variety of things can cause head aches such as concussions, over activity, dehydration, brain tumors and crying. Common types of head aches are, migraines, cluster head aches, and tension head aches.