Table of Contents (click to expand)What’s A Mushroom Cloud?Why Do Nuclear Explosions Cause Mushroom Clouds?End Of The Fireball’s JourneyHow Big Is A Nuclear Mushroom Cloud? A nuclear/atomic explosion creates a mushroom cloud because the detonating bomb suddenly releases a great deal of heat rapidly, which interacts with the cooler surrounding air and makes it less dense. The giant fireball is extremely hot, which rises rapidly in the air, creating a vacuum that is then rapidly filled by the surrounding air, forming a mushroom cloud in the process. A nuclear/atomic explosion creates a mushroom cloud because the detonating bomb suddenly releases … Continue reading Why Does A Nuclear Explosion Create A Mushroom Cloud?