Which type of bomb causes the most destruction?
Depends on exactly you want to destroy. A regular incendiary or anti-personnel bomb would not do much good against a hardened structure, nor would a high impact bomb designed to penetrate hardened structures do much good against target that was spread out. So, in order to answer your question, I would have to know what type of target you was thinking about, as weapons are designed for specific type of targets, but if you wanted massive damage and death, it would have to be between the common Hydrogen Bomb, but if you only wanted massive casualties and not so much damage, a Neutron Bomb.
A massive strategic “dirtÿ” nuclear bomb causes the most physical destruction and keeps on giving through massive fallout. But if you want the most death of the human variety, then biological weapons take the cake. Weaponized smallpox is bad, but weaponized Spanish influenza would be even worse. Cracking the human genome, we now have the technology to create humanity-cleansing weapons that not only disperse over a great radius of a bomb strike, but also continues to spread rapidly cross the entire globe via virulence more potent than the common cold and a gestation delayed enough to allow carriers to travel worldwide before showing symptoms, but after being highly contagious. With a design set to slice through the human immune system like a hot knife through butter, you can come close to if not attain a 100% total global population kill rate with just a single well-placed bomb. More destructive than that is the theoretical anti-matter bomb, which could easily decimate this entire solar
Chemical bombs can get as large as 12,000 pounds of TNT. The problem is the weight of the bomb. The so called Atomic Bomb of WWII (fission bomb) had a yield of 21,000 TONS of TNT equivalent (fat man). That is about 2,000 times as powerful as the largest chemical bombs. The largest fission bombs now have a yield of up to 500,000 tons of TNT. The so called Hydrogen Bomb (fusion bomb or thermonuclear bomb) has equivalent yields in the megatons of TNT. The first test had a yield if about 10 MEGATONS of TNT equivalent. The largest exploded so far has a power of about 50 megatons of TNT equivalent. That would make the H-bomb about 100 times as powerful as the A-bomb.
