For example, heat generated by a strip heater causes molecules in the air around the heater to move faster, in turn causing the air to expand. Because the heated air contains fewer molecules than coolerr air per given volume, the heated air is lighter and therefore rises. Simular to your fireplace chemmey. As it rises it mixes with cooler air. Heat is transferred by radiation as substances emit and absorb radiant energy, that is, heat which is transferred through space in the form of electromagnetic waves.
Heat energy is transformed into radiand energy at ate surface of a heater.
It then passes through the surrounding space and transparent objects until it contacts a a non-reflecting opaque substance with a cooler surface temperature which converts the radiant energy to heat energy. All process heating applications use one or more of the heat transfer methods above. For example, an immersion heater inside a tank heats liquids by conduction between the liquid and the heater, and by convection as the warmer liquid mixes with the cooler. An oven which employs strip heaters heats objects by conduction, convection and radiation. On Your Specific Heaters or Applications Click here to add your name to my guest log.