science

3. the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
5. the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
7. of Energy a principle stating that energy cannot be created or destroyed, but can be altered from one form to another

1. a material that doesn't transmit energy easily.
2. System the specific mechanisms in which energy is produced and used by your body
3. a substance or material that allows electricity to flow through it
4. the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
6. the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.