Spark

A spark is a triggered , which is produced when electric field strength is greater then the dielectric field strength of  a medium such that it over come it .

spark result increase in the number of free electrons and ions, due to which air become temporary electrical conductor , this process is known is dielectric breakdown.

spark can cause high explosion eg, methane gas explosion due to spark

spark are of various size , it may small or may be large which strike between clouds and ground.

and is of 100 million volts, 

BY .....DR Muhammad Naeem Arbab uet peshawar kpk pakisatan