The majority of bombs used were conventional HE (High Explosive) containing explosives such as Amatol and Torpex. These underwent gradual evolution, especially on the Allied side, becoming much more reliable and also becoming more specialised; the GP (General Purpose) bombs used in the early stages of the war became thin-cased HC (High Capacity) blast bombs, which also gradually increased in size (the largest HC bomb was 12,000lb) as bombers got more powerful. Specialised bombs such as Tallboy and Grand Slam (6 and 10 tons respectively) were also developed for penetrating massive concrete structures such as U-boat pens, or burying themselves in earth and creating an earthquake effect. Incendiaries were also heavily used, especially against cities made of flammable materials such as many German and Japanese cities. The main plan was for HE bombs to damage the buildings and make them more susceptible to incendiaries, as well as disrupting efforts to fight the fires, creating a lethal firestorm. At the end of the War, nuclear weapons were used for the first (and so far last) time. Although not very powerful by modern standards, Fat Man (21,000 tons TNT equivalent) was still far more powerful than even the heaviest bombing raid, with the added factor of fallout. However, the effects were actually rather inferior to what would have been achieved with a conventional attack employing that amount of explosive; this may be a reason behind the trend towards the use of smaller warheads nowadays, owing to the effects decreasing in proportion to the square of distance. At Nagasaki, the weapon missed the centre, which a large conventional raid would not have done. However, nuclear weapons were still awesomely destructive.
The majority of bombs used were conventional HE (High Explosive) containing explosives such as Amatol and Torpex. These underwent gradual evolution, especially on the Allied side, becoming much more reliable and also becoming more specialised; the GP (General Purpose) bombs used in the early stages of the war became thin-cased HC (High Capacity) blast bombs, which also gradually increased in size (the largest HC bomb was 12,000lb) as bombers got more powerful. Specialised bombs such as Tallboy and Grand Slam (6 and 10 tons respectively) were also developed for penetrating massive concrete structures such as U-boat pens, or burying themselves in earth and creating an earthquake effect. Incendiaries were also heavily used, especially against cities made of flammable materials such as many German and Japanese cities. The main plan was for HE bombs to damage the buildings and make them more susceptible to incendiaries, as well as disrupting efforts to fight the fires, creating a lethal firestorm.
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Bombs were invented during WWI, But they were not used until WWII.
Below I have added some links about some unconventional bombs that were used during World War 1. Bombs basically have chemicals/powders that ignite when the bomb lands or a detonator causes the bomb to explode. You will be amazed at what bombs were around then when you see the links.
No bombs were actually used during the Cold War. That was why it was not a hot war.
Great Britain used bombs
Nuclear, plane, land, and sea bombs.