how a bomb explosion destoys objects?

Question

destoys buildings,

Answer 1

Either by fire, solid impact or a shock wave that is too much for its structure to resist.

Answer 2

It depends somewhat on the type of bomb, but, very generally speaking, it is the rapidly expanding gas from a detonated bomb that destroys things.

That's pretty much all an explosive is - something that rapidly decomposes into a gas.

Some explosives, such as C4, create a fast-moving shockwave immediately upon detonation. Others, such as gunpowder, need to be confined, in, say, a sealed box, such that upon detonating the pressure builds up until the confinement bursts.

Answer 3

Shockwave through intervening medium (air, water, earth, shielding material, etc), frag (bomb case fragments, shrapnel), heat (flames, infrared radiation), and, in case of a nuclear explosion, ionizing radiation (x-rays, neutrons, fallout).

Answer 4

bomb work with nuclear fission
if u know what is nuclear fission then u get ur answer