Heat can be transferred from one place to another by conduction, convection, radiation or a combination of these methods. Conduction and convection involve the movement of particles, but radiation involves electromagnetic waves.Know More
Conduction occurs as molecules move around and bump into one another. According to the second law of thermodynamics, faster-moving (hotter) molecules give up some of their heat energy to slower-moving (colder) molecules whenever a collision occurs. The newly heated molecules then pass some of that heat to other molecules.
Substances vary in their ability to conduct heat. Air and water are poor conductors. Metals tend to conduct heat rapidly, and asbestos conducts heat so poorly that it was used as a heat insulator.
Convection happens because when a fluid (whether liquid or gas) is heated, the portion nearest the heat source expands as it gains energy. The expanding portion becomes less dense (lighter) and is pushed upward by cooler, heavier portions of the surrounding fluid. This displacement brings the cooler portions nearer the heat source until they gain energy, become lighter and move upward in turn. The resulting movement distributes heat from the source throughout the fluid.
Heat travels by convection as long as temperature differences exist within the fluid. The movement of warm air in a room and the circulation of water in a kettle placed over a fire are examples of convection moving heat.
All objects that are warmer than absolute zero continually give off energy in the form of electromagnetic waves. A body emits heat rays as its molecules vibrate.
As the rays are emitted, the molecules of the initial body lose energy. When another body absorbs the rays, its molecules become more agitated, and it gains heat energy.Learn more in Earth Science
Thermal energy moves from one object to another through heat energy. Heat energy moves through convection, conduction and radiation. The internal movement of atoms generates energy in matter. As the temperature of matter increases, the internal movement also increases.Full Answer >
Heat conduction is the transfer of internal energy (microscopic kinetic and potential energy) from a region of higher temperature to one of lower temperature by the interaction of particles like atoms, molecules, ions or electrons in the intervening space. Conduction can only take place within an object or material or between two objects that are in direct or indirect contact with each other.Full Answer >
Air masses move with the winds. One of these winds is called the jet stream, also known as a "steering wind."Full Answer >
The energy in most ecosystems flows through the food chain. In terrestrial ecosystems and most marine ecosystems, the energy flow starts in green plants that harvest some of the sun’s energy. The plants are then consumed by animals, bacteria and other creatures, which are themselves eaten by other creatures. At each step in the food chain, energy is lost as heat.Full Answer >