atmosphere is the cover of air around the earth.
name the cover of air around the earth?
atmosphere
with all this solar radiation, the air around the tropics begins to warm up. because hot air is less dense than cold air, the hot air rises into the upper levels of the atmosphere and as a result, cold air filters down into the lower levels of the atmosphere. the dynamics that provide the tropics with the rain belt are founded on the principle that warmer air is able to retain more moisture than colder air. when the colder air replaces the warmer air in the lower atmosphere, the abundant moisture from the tropics loses the ability to be stored in the atmosphere. as a result, the excess moisture that cannot be held by the colder air is then turned into thunderstorms and rain showers. these thunderstorms and rain showers are usually located along the equator, but they will extend out to the tropic of cancer, which is the 23.5 north latitude, as well as the tropic of capricorn, which is the 23.5 south latitude. it is largely a manifestation of the itcz (pronounced "itch").
tropical rain belt
cockerell used the idea of pumped air under a hull (this then becoming a plenum, i.e. the opposite of a vacuum) and improved upon it further. simply pumping air between a hull and the ground wasted a lot of energy in terms of leakage of air around the edges of the hull. cockerell discovered that by means of generating a wall (curtain) of high-speed downward-directed air around the edges of a hull, that less air leaked out from the sides (due to the momentum of the high-speed air molecules), and thus a greater pressure could be attained beneath the hull. so, with the same input power, a greater amount of lift could be developed, and the hull could be lifted higher above the surface, reducing friction and increasing clearance. this theory was tried, tested and developed throughout the 1950s and 1960s until it was finally realised in full-scale in the sr-n1 hovercraft.
momentum curtain