a loud, explosive, resounding noise produced by the explosive expansion of air heated by a lightning discharge. any loud, resounding noise: the thunder of applause. a threatening or startling utterance, denunciation, or the like.

If we are watching the sky, we see the lightning before we hear the thunder. That is because light travels much faster than sound waves. We can estimate the distance of the lightning by counting how many seconds it takes until we hear the thunder. It takes approximately 5 seconds for the sound to travel 1 mile.

The song “Thunder” is mainly about Dan Reynolds but also his band “Imagine Dragons” of how Dan conquered everything and got his breakthrough in the music industry despite of all the things he faced.

Thunder is the sound caused by lightning. Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning produces rapid expansion of the air in the path of a lightning bolt.