Okay kiddo, have you ever seen a really big explosion in a movie or a game? You know how everything around it gets knocked back and people get blown away by a big wave of air? Well, that big wave of air is called a blast wave!
A blast wave happens when there is a really big explosion, like a bomb or a volcano erupting. The explosion creates a lot of pressure and heat, which makes the air around it expand really quickly. This expansion creates a wave of high pressure air that spreads out from the explosion in all directions.
Now, remember when we talked about how people and things can get knocked back by the blast wave? That's because the wave is so strong that it can push things really hard. Think of it like a big gust of wind but way stronger!
If you were near a blast wave, you might feel really hot at first because of all the heat it's carrying. Then, the wave would hit you and you would feel a big push, kind of like being hit by a really strong wind. Sometimes, the blast wave can even break things like windows or knock down buildings if it's strong enough!
So, that's what a blast wave is - a big wave of air that comes from a really big explosion and can knock things over and break stuff. Pretty cool, huh? But remember, it's always safest to stay far away from explosions and other dangerous things like that!