When diving freely, if you don't paddle, the water pressure in deep water will increase greatly, and if you don't inhale, your body will naturally sink. In normal diving, the load is only to speed up the diving. Without wearing wet clothes and counterweight, the average density of human body is slightly higher than that of water, but after full inhalation, the average density of human body is smaller than that of water, showing positive buoyancy.
Water is buoyant, and the higher the body fat content, the greater the buoyancy. The counterweight belt can help overcome buoyancy, and moderate lead diving is different from nylon counterweight belt used for scuba diving. The free diving weight belt is made of elastic rubber, which can be better attached to the hip bone.
Extended data:
When people dive, the lung pressure under seawater increases inappropriately, the lung volume decreases, the human buoyancy decreases, and the human body gradually assumes negative buoyancy. Then it will sink like a heavy object. The matching weight is evenly distributed on both sides of the waist and can be slightly forward. If the two sides are uneven, it will make the body uncomfortable in the water.
Other commonly used equipment for free diving includes: breathing tube, free diving diving suit (split), diving computer watch, nose clip and neck fittings; Unusual equipment includes gloves, shoe covers and diving ropes.
Free diving is undoubtedly very dangerous, and drowning is one of the risks. When divers dive, the seawater will exert great pressure on their lungs, and some people even have so-called "shallow water fainting" and lose consciousness when approaching the water surface during floating. This sport requires high physical fitness, but it also requires strict personal attention. You must get rid of all distractions and devote yourself to diving.
Baidu encyclopedia-free diving