Can the shark smell a drop of blood 400 meters away from it?

People often assume that with a small drop of blood falling into the sea, the sharks in the 400m way will still "smell" the smell of blood and immediately rush to. So is this true?

Sharks have an extremely sensitive receptor in the nose, helping to analyze the exact odor.

First learn how sharks "smell" that smell. Blood droplets that come into contact with water will dissolve and blood molecules will dissolve into the water. After that, the water will follow the blood molecules that spread everywhere. If the shark comes into contact with the water carrying the blood bacteria, the sensitive receptors in the shark's nose will analyze the smell and then the shark will rely on it to swim in the direction of the water carrying many molecules. blood.

So is a drop of blood enough for sharks to detect? It is difficult to do so because the number of molecules inside a drop of blood is very small but if the water conditions are favorable, the blood molecules can still reach the nose of the mackerel. Imagine that it was similar to how people could hear the sound of a nail falling to the ground 400 meters away in a truly quiet environment. And in the ocean, it is very difficult to have a quiet environment completely because many different environmental factors make the sea always disturbed, blood molecules are difficult to travel long distances.

Furthermore, according to studies, sharks can analyze the blood smell with a blood content of 1 / 1.00,000, meaning sharks will be able to smell 1 drop of blood in 50 liters of water.

Therefore, a large amount of blood and ocean currents are needed for sharks to "sniff" them. It is extremely unlikely that sharks can smell a drop of blood at sea.