Click on the image to see an enhanced diagram. Heat is energy in
transit from warmer systems to colder systems. Heat is
associated with the internal potential and kinetic energy (an
apparently disorganized molecular motion) of a system. If heat
is a form of energy associated to the particles’ rotational,
translational and vibratory movements, how does the heat move
through the space between the Sun and the Earth, which density
is extremely low? The answer is: heat could be transferred from
warmed systems by radiation. The thermal radiation is
electromagnetic radiation that consists of particles and waves,
i.e. photons and waves, the same as visible light. Thus, the
radiative heat transfer can take place through vacuum. The
energy always moves from a warmer system to a colder system. The
energy which is moving from one system to another is known as
heat. The transfer or dispersion of heat can occur by means of
three main mechanisms, conduction, convection and radiation:
CONDUCTION: It is the flow of heat throu