Sperm may survive in air for about an hour and in most cases will become inactive within 40 minutes, and even less time when exposed to hot, dry air. Sperm are the male reproductive cells that are produced in the testes. They are usually ejected from the urethra with other semen components during male ejaculation. Sperm may survive for a relatively long time in the male reproductive tract, and when sperm are exposed to air once ejected from the body, the survival time is relatively short, and in most cases they will be inactivated within 40 minutes. As the temperature, humidity, acidity and alkalinity of the air are not suitable for sperm survival, but nowadays the technology is more advanced, through liquid nitrogen freezing, the survival time of sperm may be extended, and even a long time preservation effect can be achieved.