A life jacket is indispensable when near water, what is its principle and how to use it?

Principle: Life jacket, also known as life vest, is a kind of life-saving clothing, similar to the planning vest, made of nylon cloth or neoprene, buoyancy material or inflatable material, reflective material, etc.

It usually has a service life of 5-7 years and is one of the life-saving equipment on ships and aircraft. It is usually a vest type, made of styrofoam or cork, etc. Worn on the body, it has a buoyancy that allows the head of the person who has fallen into the water to be exposed.

If you fall overboard or a boat capsizes at sea, a buoyancy or flotation aid can help you float on the water, while a life jacket or personal flotation device is designed to flip an upside down person back into the water to avoid water from the nose and mouth.

Practical use: When wearing a life jacket in the water, the buoyancy of the front and back pieces of the life jacket should have the correct proportion, generally the buoyancy of the front piece must be greater than the back piece, which should allow the wearer to keep it upright or slightly backward, ensure that the mouth is exposed to the water, and there can be no tendency to immerse the wearer's face in the water.

Life jacket principle.

It is divided into: 1. Buoyancy material filled life jacket, that is, nylon cloth or neoprene is used as fabric, and buoyancy material is filled in the middle.

2. Inflatable life jacket: It is made of high-strength waterproof materials, similar to the principle of inflatable lifebuoy or swimming ring. It is divided into automatic inflatable type or passive inflatable type.

However, this kind of life jacket should pay attention to: avoid sharp objects to pierce or wear the waterproof layer, and air leakage will cause unimaginable serious consequences.

Life jackets come in bright colors that allow rescuers to find you from a distance; Secondly, life jackets generally have the effect of protecting the body and keeping your body from being harmed. For example, the effect of life jackets that people can float on the water, and when someone sends a distress signal, the lifeguards will easily find the trapped people, so as to quickly rescue the trapped people.

How to use the life jacket:

1. Put the whistle bag of the life jacket on the body with the whistle bag facing outward.

2. Pull the zipper, tighten the front collar strap with both hands, and tie the neck band.

3. Tie the lower strap on the left and right sides of the front body.

4. Check whether each place is firmly tied after wearing it.

5. The life jacket must fit the body.

There are usually two types of life jacket linings (buoyancy):

1. Polyethylene foam, which is relatively cheap, has sufficient buoyancy and has a wide range of use, but the buoyancy will change by about 5% with the time of immersion in water.

2. EPE pearl cotton, ** more expensive than foam plastic, but light weight and strong buoyancy.

How the life jacket works:

Buoyancy filler life jacket, the letter is made of nylon cloth or neoprene, and the middle is filled with buoyant material. Inflatable life jackets are made of high-strength waterproof materials, similar to the principle of inflatable lifebuoys or swimming rings. It is divided into automatic inflatable type or passive inflatable type.

However, the most important thing to pay attention to in this life jacket is to absolutely avoid sharp objects piercing or wearing out the waterproof layer, which will cause unimaginable serious consequences after air leakage.

How to use the life jacket:

Wear the life jacket and whistle bag facing outward; Pull up the zipper, tighten the front collar strap with both hands, and tie the neck band; The lower straps are crossed and fastened on the left and right sides of the front body; After wearing it, check whether each place is slippery and fast.

The principle is the buoyancy of water. Life jackets are generally made of styrofoam, and their density is much smaller than the density of water dissipation, so they have greater buoyancy in the water. The "Archimedes' Law" is used.

The life jacket is used by:

1.Wear the life jacket and whistle bag facing outward;

2.Pull up the zipper, tighten the front collar strap with both hands, and tie the neck band;

3.The lower straps are crossed and fastened on the left and right sides of the front body;

4.Check that each part is firmly tied after it is properly dressed.

Look.

The life jacket whistle pouch is worn outward.

2.Zip up, hands.