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The balance that ear presses
From;    Author:Stand originally

General diver goes to depth of water 3 meters of place, be ached with respect to meeting feeling by ear, this is hydraulic greaten be caused by. If with depth of water every 10 meters are an interval, pressure change is to be in 10 original meters greatly most inside. Law of common ear pressing balance is, from face guard the face holds nose, make nostril block, blow air forcibly next, can enter air be used to syrinx. The motion that should make the water that swallow Piao only as to phreatic water veteran or left and right sides swing chin, can make ear presses a balance. When making ear press a balance, maintain head day to go up to be carried out more easily. Every go downward a deepness, answer to make ear press a balance instantly, answer in time of shallow water part especially grow in quantity.
Conversation cannot have in water, of information communicate can rely on other way only, the world's accepted phreatic water gesticulation is among them one of. Master phreatic water gesticulation adroitly, it is the one major premise that ensures phreatic water safety.

To placing underwater object, the size of the flotage that it gets is equal to the weight that the water that it discharges estimates. If the object in water discharges the weight that boiled water estimates to be more than the weight of object itself, the object is float on surface, call buoyancy, sink to call negative flotage conversely. The weight that if the object discharges boiled water,estimates and object itself are equiponderant, content experiences suspension Yu Shuizhong, achieve neuter flotage. When phreatic water, it is very important that study controls buoyancy bulk in surface and benthic. Rest in surface for example when, buoyancy can save physical strength, and when benthic, the need between greater part time-sharing is maintained it is freely relaxed in neuter flotage ability in water roam, maintain good visibility. Diver can be passed match adjusting gear of heavy, flotage (BCD) the size that will adjust buoyancy with breathing depth.