Which of the following are the three main types of heat transfer?

The three main types of heat transfer are conduction, convection, and radiation.

Conduction refers to the transfer of heat through a solid material, where heat energy moves from particle to particle, typically through direct contact of molecules. This is primarily how heat is transferred in solids, where particles are closely packed and can effectively transfer kinetic energy between each other.

Convection involves the transfer of heat through fluids (liquids and gases) where warmer areas of a liquid or gas rise while cooler areas sink, creating a circulation pattern. This movement helps to distribute thermal energy throughout the fluid, making convection essential in processes like boiling and atmospheric circulation.

Radiation is the transfer of heat in the form of electromagnetic waves, primarily infrared radiation, and does not require a medium; it can occur in a vacuum. This is how the Sun's heat reaches the Earth, as it travels through the vacuum of space.

The choices that mention heat transfer types incorrectly include options that either repeat conduction, specify expansion or reflection, which are not recognized methods of heat transfer. Expansion can refer to a physical process related to temperature change but does not itself describe a method of heat transfer. Reflection pertains to light and other forms of electromagnetic waves and does not involve the transfer of thermal energy in