In a liquid, heat is transferred mainly by conduction and convection both.
According to thermodynamic systems, heat transfer is defined as the movement of heat across the border of the system due to a difference in temperature between the system and its surroundings. Heat can move from one location to another in a variety of ways. The following are the various heat transfer modes:
- Conduction – The process in which heat flows from objects with higher temperature to objects with lower temperature
- Convection – The movement of fluid molecules from higher temperature regions to lower temperature regions.
- Radiation – Thermal radiation is generated by the emission of electromagnetic waves. These waves carry away the energy from the emitting body. Radiation takes place through a vacuum or transparent medium which can be either solid or liquid.