Learn about Conduction, Convection & Radiation
We all know that Heat is a form of energy
First of all, Conduction.
If I were to heat up one end of a metal chances are that other the end will soon become hot too right? That's what Conduction is. The particles in an object heat up, when the particles become hot enough they create a chain reaction down the object. An everyday example is when you sit a pan on a stove. As the pan heats up so will the handle, making it hot to the touch.
When water starts to heat up the water on the bottom will become hotter then the water on top. Once the water becomes fairly hot it will rise to the top helping the colder water to be pushed down. Also, the colder water is more dense so it will sink to the bottom anyway.