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In reply to the discussion: News about Fukushima [View all]nadinbrzezinski
(154,021 posts)that is not what we are talking about. We are talking of hiroshima/ Nagasaki
The physics of getting actually a nuclear explosion are simply not there.
The physics of a mushroom cloud are simple, oxygen is sucked in fast, but has nothing to do with a NUCLEAR EXPLOSION, which is what the physics cannot produce on any reactor around the world. What you have though, quite possible, is a dirty bomb, but not a fission bomb. THere is a world of difference.
Sorry for not being much clearer here. There is no way on this god's green earth that you can get a fission bomb, period.
And yes, if you watch a large enough CONVENTIONAL explosion, you will see at times a small, as in very small, mushroom cloud.
Here, as way of comparison

Conventional explosion, mountain top removal.

Nagasaki