Then suspended at 15 cm above the liquid nitrogen which has a temperature of -196 degrees Celsius are not directly immersed into liquid nitrogen. Because the sperm was too cold.
To hang in the liquid nitrogen level is 15 cm above the level which has a temperature of-196° c. It does not soak into the liquid nitrogen directly because it will cause excessive cooling occurs, sperm.
hung in a 15 cm above the liquid nitrogen temperature - 196 degrees Celsius, it will not freeze down directly in liquid nitrogen because it can lead to Sperm in the evening too.