What is a convection cell?

The convection process is the main means of transfer of heat in the liquid that is exposed to the heat source. A fluid that can be a liquid or gas is usually heated from below by a warm surface; The increase in temperature results in a reduction in density, causing the fluid to increase and flow to flow in to replace it. As it rises, it loses heat to its surroundings and becomes denser and heavier than the liquid below. It cannot be descended with this rising liquid, so it spreads horizontally before it falls back towards the surface and is attracted towards the starting point of the flowing liquid. This system is known as a convection cell and is a feature of fluid dynamics that can be observed in different situations, from water, which is heated in a pot to processes on a planetary or stellar scale.

The Earth's atmosphere contains convection cells on a huge scale: the equatorial regions receive more heat from the sun than the poles, which ZPIt works that the warm air rises and then flows towards the higher widths, where it descends to flow back to the equator and forms a huge convection cell on both sides. These are known as Hadley's cells. The water vapor in rising air condenses when the air cools at higher altitudes and can form the towering clouds of kumulonimbus that produce thunderstorms. The air generally descends about 30 degrees north and south of the equator, into which he lost most of his moisture; As a result, these regions are usually dry and contain some of the big deserts in the world. The following air movement back to the equator is responsible for the business winds.

The heat from the Earth's core maintains the circulation of hot liquid rocks in the upper shell and creates convection cells under the bark. The resulting movement of molten or semi -motor rock is controlled by a process known as plate tectonics, which is responsible for the division of the bark into continental plates that move in relation to each other. This phenomenon is responsible forearthquake and volcanic activity. The areas of the Earth's surface, which sit directly above the convection cell, can divide and move from each other and create new plates, such as in the African valley. There are also convection cells in the sun. The images of the solar surface reveal a granular structure consisting of bright, hot areas surrounded by darker, cooler borders. Each granule indicates the upper part of the convection cell formed by plasma, which is heated from below and rises to the surface, the cooling then extends and descends again to the edge.