For small fields, air is a good insulator—electrons attach to oxygen atoms faster than they are knocked loose by collisions—and electric current cannot flow in any appreciable amount.
For small fields, air is a good insulator—electrons attach to oxygen atoms faster than they are knocked loose by collisions—and electric current cannot flow in any appreciable amount.
对微弱的电场而言，空气是优良的绝缘体（电子附著到氧原子上的速度，大于受冲撞而游离的速度），并不会有可观的电流流通。