A cloud may come positively charge with respect to another
cloud or the earth. When the electrical potential different between the two
become a great en ought to break down the insulation of air between them, an
electrical discharge or lighting accuser. Dry air is good insulation as
compered the moist air.
The moment air start falling, the intensity of lighting is
seen to decrease, for then, the most air condensation the electric
discharge without the spark or lighting. When there is a discharge of electric,
it causes the air around it to expend
and rolls and rumbles when it is far is that the sound wave are reflected back
and froth from cloud to clod. Since the speed of light of light is very height
compared to that sound, thunder is often heard after the lighting is seen, even
thought they occur simultaneously.
 |
