Thunder and Lightning
Thunder is the sound of a shock wave caused when lightning heats the air by moving between clouds, or to the terrestrial surface, more than 28000ºc. This hot air increases the volume and expands at high speed, but when mixed with cold air from the environment it sharply lowers the temperature and shrinks. This rapid expansion and contraction generates shock waves that are responsible for the sound of thunder.
Lighting is a very bright glare produced in clouds by electric shock. It is not exactly how lightning occurs; there are several theories but a lot of energy released by this phenomenon.
Unlike the beam, lightning descends from the clouds as branched and never reaches the earth though it continues, as the ray, what is called electric potential.
Lightning occurs as follows:
When it rains on the earth´s surface, natural evaporation occurs, taking up water droplets.
While, at a height a from 2,5 to 3 kilometres where the temperature is 15 to 20 degrees Celsius, ice particles are produced and fall by gravity colliding with drops of water evaporation going up, this causes electric charge separations before being transferred and lightning is formed.
By Dairon Mart’n Hern‡ndez (10)
Student at CEIP Mariela C‡ceres PŽrez
Los Llanos de Aridane La Palma