How long does it take for salt water to kill bacteria

Most bacteria are harmful to human health. If there is a wound on a person's body, bacteria will easily attach to it and flow into the body with the blood. So when we are injured, we need to apply some sterilizing medicines or items to the wound. If there is alcohol around, we can use alcohol to disinfect. So if there is no alcohol around, only salt water, how long will it take for the salt water to kill the bacteria?

Salt water is obviously not a "very good" disinfectant, but when there are no proper disinfectants, it should be common sense to use concentrated salt water to sterilize external injuries in an emergency. It can only be used as a makeshift product and cannot be compared with real commercial and medical iodine tincture, alcohol, etc.

It’s the same old saying: More and more Guokr people think that common sense is wrong and that they are all rumors that need to be debunked, but this is not the case.

We should treat common sense fairly from a scientific standpoint, rather than standing directly against it. Looking at common sense with prejudice in mind does not make the observer's vision more accurate.

It is not the salt that kills bacteria, but the osmotic pressure.

I think we have talked about this in middle school. If there are two areas of low concentration and high concentration in an environment, water will flow from the low concentration to the high concentration, eventually making the concentrations of the two areas the same.

To put it simply, things with less water will absorb water. Of course, this statement is too brief and not accurate, it is just a figurative summary.

The same principle applies to so-called salt sterilization. If the salt concentration in salt water is greater than that in bacterial cell fluid, the water in the bacteria will flow into the salt water. Depending on the degree of water loss from the cells, the bacteria may die.

However, nature is full of life, and different bacteria have different salt tolerance abilities, so the bactericidal ability of salt water is also different.

The statement that salt water can kill bacteria is actually quite rogue, because it crudely generalizes the particularity to the generality. Even if a certain level of salt water can kill bacteria, it does not mean that all salt water can kill bacteria. For example, the lightly salted water that humans can drink is definitely useless, and the same goes for the normal saline solution commonly used in hospitals.