Except for the Equatorial low, the others form matching pairs in the Northern and Southern Hemispheres. Meanwhile, the cold dense air at the Poles sinks and moves towards the equator. This low-pressure belt extends from 0 to 5° North and South of Equator. I generally recommend getting a single-pronged belt. Sub-Tropical High Pressure Belt 3. This is an important topic to study for candidates, as this is a part of the UPSC geography syllabus. When the sun is overhead on the Tropic of Cancer (21 June) the pressure belts shift 5° northward and when it shines vertically overhead on Tropic of Capricorn (22 December), they shift 5° southward from their original position. At the equator, sun’s rays are almost vertical and the hot air being less dense, rises or ascends. Prohibited Content 3. Winds always blow from high pressure to low pressure. It is interesting to note that this zone of high pressure is not a continuous belt but is broken into a number of high pressure centres or cells (fig. Narrow V-belts. It is, thus, apparent that the sub-tropical high pressure belt is dynamically induced. Warm air being light, the air at the Equator rises, creating low pressure. Thus, this belt owes its origin to the rotation of the earth and sinking and settling down of winds. In fact, temperature and rotation of the earth together contribute to the formation of world pressure belts. Air Circulation depends on heating of the earth surface by the sun and the rotation of the earth. Equatorial Low Pressure Belt: V-belts Standard V-belts. It is important to note that this high pressure belt is not thermally induced because this zone, besides two to three winter months, receives fairly high temperature throughout the year. On account of this inclination, differences in heating of the continents, oceans, and pressure conditions in January and July vary greatly. Polar Highs. During winters Westerlies prevail and cause rain. Global winds blow in belts encircling the planet. 35.1). The air, therefore, expands and rises as convection current causing low pressure to develop here. Subtropical High-Pressure Belts. Global winds are caused by the combination of pressure belts and the Coriolis effect. zHigh pressure belts are dry while low pressure belts are humid. The world pressure belts are imaginary belts that circle the earth. There are light, feeble and variable winds with in this convergence belt. Ocean currents; Westerlies and their location; Polar easterlies; Apparent movement of the sun according to season; Movement of pressure system due to apparent movement of sun One part blows towards the Equatorial Low-Pressure Belt. In any industrial environment, you need to have fans to maintain a safe and comfortable atmosphere. Atmospheric Circulation, Climatology, Geography, Pressure Belts. There are main main four pressure belts in the world 1.Equatorial trough/equatorial low pressure belts.this extending from 0–5degrees north and south of the equatorial. The planetary distribution of pressure, in the 7 belts is determined by two major factors viz. It begins with warming of air surrounding the equator, which creates a large region of lower surface pressures (due in part to the fact that columns of warm air weigh less than columns of cold air). Except for the Equatorial low, the others form matching pairs in the Northern and Southern Hemispheres. It may be noted that due to great contrasts of temperatures of the continents and oceans during northern summer the low pressure belt becomes discontinuous and is found in a few low pressure cells while the temperature contrast between the continents and oceans is much reduced during winter and hence low pressure belt becomes more or less regular and continuous in the northern hemisphere. In the Subtropical region, the descending air gets divided into two parts. 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