the term for heat transfer because of direct contact is know as conduction.
Conduction is the transfer of energy from one molecule to another by direct contact. This transfer occurs when molecules hit against each other, similar to a game of pool where one moving ball strikes another, causing the second to move.
Various heat transfer mechanisms exist, including convection, conduction, thermal radiation, and evaporative cooling.
Conduction. Conduction is the transfer of heat through stationary matter by physical contact. (The matter is stationary on a macroscopic scale—we know there is thermal motion of the atoms and molecules at any temperature above absolute zero.)
Heat transfer by thermal radiation is transfer of heat by electromagnetic waves. It is different from conduction and convection as it requires no matter or medium to be present. The radiative energy will pass perfectly through vacuum as well as clear air.
In fluids, heat is often transferred by convection, in which the motion of the fluid itself carries heat from one place to another. Another way to transfer heat is by conduction, which does not involve any motion of a substance, but rather is a transfer of energy within a substance (or between substances in contact).
Energy transfers A swinging pirate ship ride at a theme park. Kinetic energy is transferred into gravitational potential energy. A boat being accelerated by the force of the engine. The boat pushes through the water as chemical energy is transferred into kinetic energy. Bringing water to the boil in an electric kettle.
There are three methods of energy transfer that we need to learn: conduction, convection, and radiation. Conduction: Heat is thermal energy, and in solids it can be transferred by conduction. Convection: Fluids, that is both gases and liquids, can transfer heat energy by convection. Radiation:
Kinetic Energy. Energy is transferred from one object to another when a reaction takes place. Energy comes in many forms and can be transferred from one object to another as heat, light, or motion, to name a few. This energy would be in the form of motion, with the person lifting the blue ball to a higher level.
Radiation is the least important mode of heat transport in the Earth. The process of heat exchange between the Sun and the Earth, through radiation, controls the temperatures at the Earth’s surface. Inside the Earth, radiation is significant only in the hottest parts of the core and the lower mantle.
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
Some common examples of Radiation are Ultraviolet light from the sun, heat from a stove burner, visible light from a candle, x-rays from an x-ray machine. This form of energy transfer is the radiation of heat.
The most efficient method of heat transfer is conduction. This mode of heat transfer occurs when there is a temperature gradient across a body. In this case, the energy is transferred from a high temperature region to low temperature region due to random molecular motion (diffusion).
Q = m × c × Δ T Q=m times c times Delta T Q=m×c×ΔT
|Δ T Delta T ΔT||Difference in temperature|
The different methods of cooking or heat transfer are broken down into conduction, convection, and radiation.