Generally, when divers dive to a depth of 2 or 3 meters, they will feel ear pain, which is the factor leading to the increase of water pressure. Because diving into the water will have a pressure of 10 meter, an atmospheric pressure, and the human body will be evenly pressed, and there will be no feeling, only the cavity in the body such as the eardrum will hurt. To relieve earache, it is necessary to balance the ear pressure.
2. How to practice the ear pressure balance method?
The general method of ear pressure balance is to hold the nose from the outside of the mask to block the nostrils, and then blow hard from the nostrils to make the air enter the ear canal, so that the pressure inside and outside the ear is consistent. It is easier to keep your head up when balancing ear pressure. Or cooperate with the left and right chin movements to make the action of swallowing saliva.
For many beginners, it is always difficult to balance ear pressure at first. One trick is to balance the ear pressure several times on the shore before entering the water. When diving, don't wait until your ears hurt. Start diving from the beginning, especially in shallow water, and increase the number of times to balance the ear pressure. After a few more exercises, the balance of ear pressure will not be a problem. When you have more diving experience, you will find that ear pressure balance is not a problem at all. An experienced diver can even balance the ear pressure by swallowing water or swinging his chin from side to side.
3. What are the steps before diving?
3. 1. Face your diving partner and make a "diving gesture" to let your diving partner know that you have "started" diving.
3.2. Record the current time (or look up the table with potential partners), and record the official diving (entry) time, which can be used as the data basis when the "decompression diving mode" is needed.
3.3. Pick up the compass sleeve, aim it at the water outlet of your launch from the sea surface, and record the scale, which can be used as the data basis for the return trip. (Suitable for simple compass orientation).
3.4. Replace the breathing tube with the auxiliary head (breathe evenly at this time).
3.5. Make an OK gesture with your potential partner, make a gesture to start diving (at this time, the charging and discharging valve of BC will expand a little (for fear that you will sink at once), then start to get discouraged (click on BC to get discouraged), dive slowly, hold the charging and discharging valve of BC in your left hand (raise your left hand) and hold the depth gauge in your right hand (pay attention to the depth), and dive slowly and slowly. When diving, face to face with your partner and pay attention to his diving speed. If your partner dives too fast, tell him to slow down. Of course, you should pay attention to the balance of ear pressure.
Knowledge necessary for diving
1. Safe stop: You must stop safely at five meters for three to five minutes before coming out of the water.
2. Diving computer watch: Diving computer watch is much more important than spare vice head and breathing tube, and it is the key to safe diving. It is expected that diving computer watches will become compulsory equipment in the near future.
3. Slower rising speed: According to the new regulations of the US Navy, organizations will change the rising speed from 60 feet per minute to 30 feet per minute.
4. Reverse diving mode can be allowed. Divers who use diving computer watches can dive deeper than the last time without decompression; Divers using mechanical watches should still follow the forward diving mode to ensure safety.
5. Cross identification. After 1998, many training authorized teachers allowed the college to organize classroom and swimming pool courses in A's training courses and open courses in B.
6. Breathing tube. Breathing tube has always been considered as a lightweight basic equipment, but deep diving is often entangled in fishing nets or camera straps, causing the mirror to fall off. The new regulations suggest that unless there is long-distance snorkeling on the water, try not to use breathing tubes.
What are the benefits of diving?
1. Diving is beneficial to shaping people's body and mind in all aspects: the benefits of diving are not only that the fantastic world in water brings great spiritual enjoyment to people, but also that regular diving can develop muscles of all parts of the body, improve physical qualities such as strength, speed, endurance and flexibility, cultivate people's will to be brave, tenacious, cooperative and cautious, increase intelligence, self-confidence and leadership, and improve academic performance. For example, for a child aged 10, not only can he learn how to install complex equipment, but he can also master the necessary underwater survival skills.
After becoming a qualified diver, students will find that they have learned a lot, not only diving, but also knowledge of physics, physiology and oceanography.
2. Diving has the function of losing weight: the environment of water area is very different from that of land. Studies have proved that people's resistance in water is more than 800 times that in air. The great resistance brought by water will increase the difficulty and total amount of exercise, so that you can complete an action with more than 6 times the usual strength, thus achieving twice the result with half the effort. On the other hand, the thermal conductivity of water environment is more than 20 times that of air, even if it is still in water, it will consume a lot of energy.