When surviving at sea, if you don t have fresh water, drink water

Ask the subject for me. The reason why seawater cannot be drunk is because it contains a lot of salts and a variety of minerals, although some of these elements are necessary for the human body, but due to the high concentration of mineral elements in seawater, after entering the human body, it will cause people to lose water under the action of osmotic pressure.

In the process of survival, water is an indispensable supply for the human body.

Introducing a possible solar distillation method to distill fresh water.

With the help of an inflatable bag placed at the bottom, the conical container floats in the sea, and the sunlight passes through the transparent container, evaporating the seawater inside, and the water vapor rises to the dome of the container and condenses, and small water droplets flow down the inner wall of the container into the annular storage tank below. With the help of an inflatable bag placed at the bottom, the conical container floats in the sea, and the sunlight passes through the transparent container, evaporating the seawater inside, and the water vapor rises to the dome of the container and condenses, and small water droplets flow down the inner wall of the container into the annular storage tank below. Usually, a pipe is split from the annular reservoir to direct fresh water into the water bag that is connected at the other end; However, there are also relatively simple devices, which do not connect the water bag, and the inverting device directly pours out the fresh water collected inside.

In this principle, it is important to ensure that the container is relatively airtight and thus maintain the temperature difference between the inside and outside of the container.

It's the device of the red dot in the picture!

Ask the subject for me.

If five great white sharks beat one crocodile, can they beat it?

1.The reason why marine fish cannot survive in freshwater is because they have adapted to the osmotic pressure of seawater.

2.Due to the high osmotic pressure of seawater and the low osmotic pressure of the fish body, the water will continue to be lost, and they must be replenished by drinking water, while the osmotic pressure of fresh water is lower than that of the fish body, so the water will continue to seep in, and the sea fish that cannot drain will be swollen to death.

3.Of course, there are also fish that can survive both in the sea and in fresh water.

Freshwater fish can only survive in lakes, not in the sea. Because the salinity in the seawater is particularly high, this kind of water is not suitable for freshwater fish to survive, which will cause freshwater fish to have obvious uncomfortable symptoms, resulting in the loss of freshwater fish.

The salt content of seawater is very high, while freshwater fish generally have a lower tolerance for salt, while the average salinity of seawater can be reached. So freshwater fish can only survive in lakes or rivers and can't survive in seawater, if you put freshwater fish in seawater, freshwater fish will die, it can't survive. We can also empathize with the fact that if a person suddenly drinks a particularly salty water, it will cause an imbalance between water and salt, and our body will have a significant discomfort reaction, just like a fish suddenly entering the sea.

Therefore, for the safety of freshwater fish, we must isolate the river from the ocean, so that the water from the ocean cannot be poured into the river. In fact, not only freshwater fish cannot survive in the ocean, but also seafood in the ocean cannot survive in freshwater lakes. Therefore, each organism has its own characteristics, and humans cannot change this characteristic, and if you want freshwater fish to survive in seawater, you can carry out gradual experiments.

Fish and people are the same, they all need to maintain the balance of water and salt, if the water and salt are out of balance, the cells will burst, and the fish will die due to lack of water. I believe many people know that if you drink a lot of water, the oxygen content in your blood is very low at this time, you need to drink a little light salt water or hang some normal saline, so that the water and salt can be balanced, and the phenomenon of dehydration can be alleviated. Therefore, fish and people are the same, they cannot be unbalanced with water and salt, and the imbalance of water and salt will lead to the direct destruction of cells and the death of freshwater fish.

Physical strength is not the main difficulty encountered at sea.

Drowning is the biggest difficulty in surviving at sea. You can't save yourself, you can only rely on him to save you.

Rescue method: Keep the airway open. Immediately remove sediment and vomit from the mouth and nose. Loosen collars, buttons, breastfeeding covers, underwear, belts, straps, etc., but pay attention to keeping warm, and if necessary, wrap your tongue in a hand towel or gauze to keep your airway open.

Water control (pouring water). The first responder kneels on one leg and bends the other knee, places the drowning victim's abdomen across his thigh, causing his head to droop, and then presses on his back to pour out the fluid in his stomach. The first aid provider can also pour out the water by holding the drowning person's waist from behind, so that his back is up and his head is down.

Artificial respiration with extrathoracic cardiac compression, macrobaric pressure, and oxygen. It should not be stopped in transportation, and it can only be stopped if it is judged to be better or dead.

Use your hands to guide the acupoints such as Renzhong and Yongquan.

The lack of fresh water can be solved by:

Dock for water. Fresh water gushing out from a rupture at the bottom of the ocean can form fresh water in a certain area, and experienced people or luck can spot it.

Collect rainwater and dew. Rainwater can't be stored for a long time, so when there is rainwater, you should drink it first.

Biological water, obtained from fish.

But the salt content is small.

<> fish live in brackish water and fresh water in inland lakes and rivers, if a fish living in fresh water follows the river into the ocean, can it survive in the brackish water? Unfortunately, despite the fish's ambition to aspire to the sea, it is difficult for a freshwater fish to survive in the sea.

There are two types of fish: saltwater fish and freshwater fish. Freshwater fish are the most common freshwater creatures and must spend their entire lives in freshwater waters. Common goldfish, silver carp, grass carp, etc. are all freshwater fish.

Marine fish are fish that live in seawater, such as anglerfish, flounder, tuna, etc.

So why can't freshwater fish go to sea?

It turns out that bony fish living in seawater have a seawater desalination device in their gills, which is composed of "chlorine secretion cells", which is a desalination "workshop", when the fish sucks into the seawater, it can quickly desalinate the salty seawater.

In addition, the epidermal membrane, inner cavity membrane and oral membrane of marine fish are all semi-permeable membranes. When seawater is inhaled into the oral cavity, the oral mucosa or the mucosa of the inner cavity blocks the seawater in the oral cavity, and then through inhalation, it increases the pressure of the oral cavity to form a pressure difference between the inside and outside of the membrane, and the water after desalination is sucked into the body, and the salt and some other components that remain in the oral cavity after being decomposed are excreted from the body through the excretory system. In this way, all that remains in the body of the fish is fresh water.

In addition, marine cartilaginous fishes do not desalinate seawater like bony fish, but they have their own ability to maintain osmotic balance in and out of the body. Marine cartilaginous fish contain higher concentrations of urea and trimethylamine, and the osmotic pressure of body fluids is slightly higher than that of seawater, so that seawater can penetrate through the gills and oral mucosa, while excess water is excreted by the kidneys. However, freshwater fish do not have such skills.

Although they are both fish, their different physiology and growth environment lead to the difference between marine fish and freshwater fish, although they live on the same earth, they cannot swim in the same water.

Therefore, if freshwater fish are released into seawater, freshwater fish should not be able to adapt to the high concentration of salt, and will die of dehydration due to osmosis.

Because the composition of seawater is different from that of freshwater, it contains a lot of salt, which is not suitable for freshwater fish to survive, and freshwater fish cannot breathe and die after entering the sea.

Because freshwater fish are accustomed to surviving in the freshwater environment, in the deep sea, due to the increase in the salt concentration of seawater, freshwater fish cannot adapt to the normal water in the sea, and cannot carry out normal life activities, so they cannot continue to survive.

If the freshwater fish is placed in the seawater, then the fish is like a human drinking salt water when they are thirsty, the more they drink, the thirstier they become, and finally they die of dehydration.

1. The salt content of seawater is high, and the concentration of salt in freshwater fish body fluids is higher than that in freshwater environment, and due to osmosis, water will continue to enter the body from outside the body.

2. Excessive water makes the kidneys of the fish work harder, and constantly excretes a large amount of water in the form of urine, and at the same time, the salt-absorbing cells on the gills of the fish can increase salt to the blood, so that the water and salt in the body can be constant.

3. Seawater contains more metal ions, the salt content is higher, and its concentration is much higher than that in the fish, and the fish have a tendency to lose water to the surrounding environment and there is a risk of dehydration.