Why can sunlight kill germs?
Because there are infrared and ultraviolet light in sunlight. Infrared evaporate water in the germs and kill them by dehydration, while ultraviolet light condenses a nucleus, causes bubbles in the enchylema and kills the germ.
Why may the sunlight sterilize?
Because in the sunlight includes the infrared and the ultraviolet ray. The infrared may evaporate the moisture, lets the bacterium dehydration die. The ultraviolet ray may cause the cell nucleus concentration, but in 細胞漿 produces the vacuole, causes the bacterium death