Caption: "Nuclear bomb mushroom cloud height/yield plot (horizontal logarithmic scale; vertical linear scale) cosmetically enhanced to illustrate size of Fat Man and Castle Bravo explosion mushroom clouds: mushroom clouds:

0. Approximate altitude band airliner use.
1. Fat Man 22.5 kt
2. Castle Bravo 15 Mt.

CAUTION: The data represented in this plot are NOT verifiable because no sources are made clear. This image should NOT be used to present its unsourced data as fact unless sources are also provided for the data." (Somewhat edited.)

Note 1 megaton (Mt) is the chemical energy of 1 megaton of TNT converted into the energy of an explosion (see Wikipedia: TNT equivalent). Note also 1 Mt = 4.184*10**15 J. Note moreover:

m*c**2 ≅ 1 kg * (3*10**8 m/s)**2 ≅ 9*10**16 joules
       ≅  2.5*10**10 KW-hours ( 1 kW-hr = 3.6*10**6 J )
       ≅ 20 megatons of TNT ( 1 megaton TNT = 4.184*10**15 J )  .  

Credit/Permission: User:Anynobody~commonswiki, 2007 / Public domain.
Image link: Wikipedia: File:Nukecloud.png.
Local file: local link: nuclear_explosion_yield_mushroom_cloud.html.
File: Atomic Nuclear file: nuclear_explosion_yield_mushroom_cloud.html.