<span>Heat in Physics is an energy that is in a process of transfer between a system and its surroundings other than the transfer of matter. In Thermodynamics, a science that deals with the study of heat and temperature and their relationship to energy and work, finer details of the process is unpredictable. Heat flows from a hotter to a colder body when there is a physical pathway. This pathway is suitable and can be direct such as radiation and conduction. It can also be indirect as in convective circulation.
</span>There are three types of heat transfer or heat propagation; conduction, convection and radiation. Heat transfer is the process by which heat projects externally however, depending on the temperature and pressure. Also called the movement of heat from a low temperatured state which increases as heat progresses. Conduction is the heat transfer by contact, immediate contact. Convection is the transfer of heat through air and water. <span>Radiation is the transfer of heat regardless of the presence of atoms or particles. </span>
Majority of energy, around 90% in fact, is lost between each trophic level, mostly due to the energy usage of sustaining life, and a lot is lost as thermal energy.
