A simple physics question, about water and air humidity, please explain the reason.

B After water is sprinkled on the ground, the water on the ground absorbs heat and evaporates into water vapor, which enters the air, increasing the humidity of the air, and the water vapor content in the air tends to be saturated, so the water on the human surface cannot continue to evaporate into the air. Without evaporation, there is no way to take away the heat of the human body, so people will feel stuffy. At this time, the body will adjust and increase the concentration of salt in sweat, so that sweat will continue to evaporate, which is why sweat has a salty taste.