Why does an explosion make noise?
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an explosion is a sudden and violent expansion of matter outwards, usually caused by a rapid combustion or other chemical reaction, or by immense pressure suddenly being released.
sound is caused by air particles vibrating and being pushed against each other, forming waves like ripples in water. those waves hit your ears and your ears process that as sound for your brain.
a sudden expansion of matter from an explosion is going to displace the air around it, violently and suddenly pushing it back, creating huge “ripples” that is heard as an explosion. additionally, if the explosion produces a lot of heat, the air around it quickly heats up and expands, further pushing outwards. this is also why lightning creates thunder. the immense amount of heat cause by a lightning bolt heats the air around it to 50,000F in just a fraction of a second and causes it to violently expand outwards, causing thunder.
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