Why do divers have to wear special wetsuits when working in deep water?

The clothes can stand it, but the bones can't stand it.

The pressure of the liquid increases with depth. When working in deep water, the pressure increases, so wear a special wetsuit.

Under normal pressure, people are in a submarine as if they were on land. However, if the normal pressure is exceeded, then the human body will not be able to stand it, and a decompressor should be installed in the submarine, so that the human body will not be harmed.

Categories: Science & Engineering.

Analysis: The most common danger of diving is: "diver's disease", that is, divers.

The person suddenly rises to the surface of the water from the high-pressure environment under the water, so that because of the high pressure.

A large amount of gases dissolved in the blood, mainly nitrogen, are released rapidly.

comes out and forms bubbles. When these bubbles circulate to the small blood vessels, they form air plugs.

Plugs, blocking the flow of blood. Some bubbles stop in the alveoli because of the air.

Expansion ruptures the alveoli. When "diver's disease" occurs, there will be itching, musculoskeletal pain, blurred vision, limb weakness, paralysis, and dizziness.

Dizziness, shortness of breath, or even coma or death. **Method.

It is to send the patient to an artificially high-pressure environment, and then slowly decompress to normal.

atmospheric pressure.

Air embolism: Air embolism is the enemy of divers, due to our in.

The underwater breathing shouting sail traps the high-pressure gas in the bag, so when the floating speed is too fast, it can cause the alveoli to rupture. Therefore, do not stop breathing while ascending, be careful.

Rise speed, and breathe big and slowly.

Nitrogenism: Occurs in the average diver up to 30 meters. But the most satisfying.

Decreased ability to think and judge, like getting drunk, can lead to death in severe cases.

Ascent: Control the ascent speed within 18 meters per minute, i.e. don't.

Rise faster than your own exhaled bubbles; Don't stop breathing; When rising.

Looking up at the water, you can stretch out your right hand to specify the direction, paying attention to the back, the body.

Rotate slowly. Adjust ear pressure: For first-time dives or those who have not dived for a long time, water.

The pressure can cause discomfort and even pain in a person's ear canal. Apply the hand at this point.

Pinch your nose and puff into your nose so that the air pressure in your ear canal rises and counteracts the pressure of the water. When diving downward, if the pain in the ear is unbearable, stand up.

I engrave it on the float. The following conditions are not suitable for diving: colds, nervous terror, and ear.

Nasal disease, heart disease, high (low) blood pressure, drunkenness, diabetes.

The technical term is called: "decompression sickness".

The diver rises rapidly or does not make a decompression stop after a long or deep dive; Divers board the plane immediately after the dive. Even if the aircraft is refrigerated, the cabin pressure will occur if it is not maintained at sea level. or when the engineer comes out of a caisson or pit that excludes groundwater after pressurization. These conditions cause gases (mainly nitrogen) to be dissolved in the body's tissues, forming bubbles in the body and causing disease.

Rapid surfacing can lead to decompression sickness.

According to p= liquid.

Gh, in the same liquid, the pressure of the liquid is proportional to the depth of the liquid; The deeper the diver dives, the greater the pressure of the water on him;

Wearing a strong wetsuit can enable the diver to withstand greater water pressure, so as to avoid the huge water pressure to the diver's body and protect the diver

Therefore, the answer is that the pressure of water increases with the increase of depth

Answers]: a, b, d, e

The underwater modification and installation of divers should comply with the provisions of the lower belt judgment column: (1) After the components are basically in place and stable, the divers can approach the components to be installed.

2) Divers are not allowed to stand between the two components to operate, and the air supply pipe is not allowed to be placed in the joints of the components. When the current velocity is high, the diver should operate in the direction of the countercurrent.

3) The installation position of the component should be adjusted with special tools. Divers are not allowed to place any part of their body between two components.

Summary. If the amount of water discharged by an object in the water is greater than the amount of the object itself, the object will float on the surface of the water, and we call it positive buoyancy. Otherwise, it sinks, which is called negative buoyancy.

If the amount of water discharged by the object is equal to the amount of the object itself, the object will be suspended in the water and reach neutral buoyancy.

When diving, it is important to learn how to manipulate buoyancy on the surface and underwater. For example, when resting on the surface, positive buoyancy can conserve strength, while when underwater, you need to maintain neutral buoyancy most of the time to allow you to swim in the water with ease, maintain good visibility, and also prevent damage to you and the fragile creatures in the water.

The diver is able to adjust the magnitude of buoyancy by counterweights, buoyancy adjustment equipment (BC) and the depth of breathing.

Divers wear ventilated diving gear to work underwater, and their buoyancy should be controlled in what state.

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If the amount of water discharged by an object in the water is greater than the amount of the object itself, the object will float on the surface of the water, and we call it positive buoyancy. Otherwise, it sinks, which is called negative buoyancy. If the source of the amount of water discharged by the object is equal to the amount of the object itself, the object will be suspended in the water and reach neutral buoyancy.

When diving, it is important to learn how to manipulate buoyancy on the surface and underwater. For example, when resting on the surface, positive buoyancy can conserve strength, while when underwater, you need to maintain neutral buoyancy most of the time to allow you to swim in the water with ease, maintain good visibility, and also prevent damage to you and the fragile creatures in the water. Divers are able to adjust buoyancy with counterweights, buoyancy adjustment devices (BC) and the depth of breathing.

Please refer to it.

Hello dear, happy to answer for you. As a self-contained diver, there are three basic rules to follow before entering the water: Check your diving gear:

Diving equipment needs to be carefully inspected before entering the water to ensure that all equipment is in order, and the equipment is checked for integrity and reliability. Including: whether the gas cylinder has enough oxygen, whether the mask is clear and usable, whether the life-saving equipment is adequate, etc.

If necessary, in-depth testing is required to check that the cylinders, regulators, and other equipment are functioning properly. Establish a dive plan: Establish a detailed dive plan before entering the water, taking into account the time, depth, water temperature, sea conditions of the dive area, and other safety factors.

The purpose of setting up a dive plan is to help the self-contained diver plan the entire dive and ensure that the dive process is safe and reliable. Perform pre-dive buoy marking: Before divers enter the water, diving warning buoys should be placed in advance to mark the diving process and waiting for the afloat process.

This marker can help the observer detect the abnormal situation in time after the diver enters the water, and prepare an emergency plan.

Answer] :d Jiaozao Cha Material, pp. 328-p337

Divers should be equipped with first-aid kits and corresponding first-aid equipment at the work site. If the water depth is more than 30m, it should be equipped with equipment such as decompression, concealed eggplant cabin, etc.

1. Before diving operations, divers should master the diving task, diving environment, working part, water depth, flow rate, flow direction, etc., make technical disclosure to divers, and implement relevant safety operation regulations. 2. The diving equipment should be inspected before diving and pressurization, and the operation can only be carried out after confirming that it is good. 3. The purity of the air source supplied to the diver for breathing must comply with the relevant national regulations.

4. No lifting operations or ships shall pass on the water surface of the diving operation site; No blasting operations shall be carried out within a radius of 2000m, and no anchoring, vibration piling, hammering piling, air curtain caisson sinking, electric shock of Qingsun fish, etc. shall be carried out within a radius of 2000m, and blasting operations shall not be carried out within a radius of 2000m. 5. When there are more than 4 waves on the water surface, diving operations are not allowed. 6. Ventilated heavy diving operations shall comply with the following provisions:

1) When the diver dives or ascends, the air supply hose, signal rope and dive guide rope should be separated. 2) Divers are not allowed to cross in the cluttered rod file; Do not pass through the partition beam to enter other wells. 3) When inspecting or removing the entanglement on the thruster of the motor boat, a special person should be assigned to guard it in the engine room.

4) When there is a large disparity between the height of the underwater working surface, the air supply hose and signal rope should be tightened appropriately. 5) The speed at which the signal rope and air supply hose are released and retracted should be consistent with the speed at which the diver dives or ascends. 7. Light diving operations shall comply with the following regulations:

1) The dive time should be determined according to the dive depth calculation. 2) When deep diving, you should be equipped with a diving doctor and necessary diving decompression equipment. 8. When the flow rate is greater than 1m s, the diving operation shall comply with the following regulations:

1) The diver's helmet mask should be added with a protective cover, the fall of the lead, diving shoes and diving guide rope should be aggravated, and the air supply hose and signal rope should be tested for tensile force. 2) The diving vessel should anchor upstream of the diving operation site. 3) The diver should use a safety belt and dive up or down or up on the dive guide rope; At the bottom of the water, the guide rope should not be thrown away, the amount of air used should be reduced, and the walking should be facing upstream.

9. During night diving operations, in addition to the lighting of the diving boat and diving platform, lamps with large illumination should also be installed to shine on the water surface of the diving site. 10. When diving in a hot environment, the air reservoir should be filled with compressed air before diving, and a cold water pipe should be installed on the air reservoir to cool down, and then used or supplied with an air conditioning pump after the compressed air is cooled; When diving in caissons or pipe strings, there should be ventilation and silver chains.