The fish scales are fine, but the internal tissues have been frozen. It will not damage the cells for instant freezing, but it will be thawed. Because the thawing is slowly absorbed and thawed, it will damage the fish’s tissue cells, so it is The fish that has been frozen in liquid nitrogen is then thawed. Usually the fish will not live for a few hours because the internal cells have been damaged seriously, but usually, you will not see the fish die because the fish are sent directly. In the kitchen…
Liquid nitrogen, also known as liquefied nitrogen, was not able to liquefy nitrogen one or two hundred years ago, so it was called a permanent gas. The popular meaning was that nitrogen was considered to be a gas that could not be liquefied.
Later, with the advancement of technology, people liquefed nitrogen by cooling. Generally, at one atmosphere, as long as the temperature drops to -196 ° C, nitrogen will liquefy. If pressurized, then critical. The temperature will rise and the nitrogen can be liquefied without reaching -196 °C.
One experiment abroad is to put the fish in liquid nitrogen. As shown in the figure below, they put the fish in liquid nitrogen for about one and a half minutes. At this time, the fish has been frozen and stiffened, and it seems that it must be frozen. It is.
Then the experimenter put the fish from the liquid nitrogen into the water at room temperature with rubber gloves. About a minute later, the fish carp had already started to move, and it took a long time for the fish to survive.
At this time, the fish is barely alive and dying, because the damage to the cells during the thawing process is irreversible. Therefore, the organ tissues of the fish are severely damaged, that is, the stab wounds of the ice crystals, and the survival time of the fish is not Will be more than a few hours.
Some people may ask, will people get hurt when they reach in?
There is nothing wrong with the human hand reaching into the liquid nitrogen for 10s-15s. You will only feel a little cool and will not be frostbitten. This is because of the Leiden Frost effect, because it is relative to liquid nitrogen. Your hand is a “high temperature” surface, and liquid nitrogen will vaporize around your hand to form a vapor film that will block liquid nitrogen from continuing to absorb heat.
However, when the hand stays for a long enough time, you will feel the hand getting colder and colder. If you don’t take your hand out, you will be “burned”.
Yes, it is indeed a “burn”. I didn’t make a typo, because when the liquid is nitrogenized, your hand will encounter “high temperature” air, and the air will burn when compared to your hand. Your hand, so when you put your hand into the liquid nitrogen, if you feel the coolness is increased, it is best to take your hand and put it into the cold water to wash away the liquid nitrogen in your hand to avoid danger.
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