Which we call convection is actually a combination of conduction through a fixed medium and convection, while heat carried by a moving medium. for example if there is running water, say in contact with a hot surface, some liquid was heated by conduction and heat it brought along with the moving liquid. If the water is warm then come into contact with a cold surface, the water will give a portion of its heat to the surface, again through conduction.
Sometimes the volume of water or air that is not moving can be made moving with heated. For example, there are a number of water in a tank at a quadrilateral. If the heat imposed on the bottom of the tank at one end, the water at the end will warm by conduction. The water will expand in all directions and becomes less dense than before.
The water will not be able to move along the bottom of the tank because the cold water around it will be more tightly than warm water and will prevent them from passing. The cold water is heated above section is also more tightly. But may not provide the same pressure on hot water because the water pressure decreases when the depth is reduced. Therefore, the warm water will rise and it will heat up the top by convection.
When the hot water reaches the surface, the water will flow along the surface until it reaches the other end of the tank, in the meantime, the existing cold water tank has been moved toward the bottom end of the warm, the warmer and less dense. Thus, there was a complete circle of the movement of water. Circular motion as it is called convection currents
Sometimes the volume of water or air that is not moving can be made moving with heated. For example, there are a number of water in a tank at a quadrilateral. If the heat imposed on the bottom of the tank at one end, the water at the end will warm by conduction. The water will expand in all directions and becomes less dense than before.
The water will not be able to move along the bottom of the tank because the cold water around it will be more tightly than warm water and will prevent them from passing. The cold water is heated above section is also more tightly. But may not provide the same pressure on hot water because the water pressure decreases when the depth is reduced. Therefore, the warm water will rise and it will heat up the top by convection.
When the hot water reaches the surface, the water will flow along the surface until it reaches the other end of the tank, in the meantime, the existing cold water tank has been moved toward the bottom end of the warm, the warmer and less dense. Thus, there was a complete circle of the movement of water. Circular motion as it is called convection currents
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