UTC I agree with User Man with two legs that the graph is extremely misleading See this quote about or maybe from Edward Tufte Before the development of spreadsheet graphing the most common graphical mistake was the use of artist drawn 3 D images with the height of 3 D objects representing the magnitude of the data points In these charts both the height and the width of the drawn object increase proportionate to the magnitude of the data points The effect is to exaggerate the differences in magnitude as the viewer tends to perceive the area of the figures rather than just the height as representing the magnitude Source The image suggests that the Tsar Bomba which was three or four times more powerful than Castle Bravo is actually 40 times larger in volume or 10x larger in area If explosion volume went up by about the cube of the yield not really accurate but much closer than this chart the Tsar Bomba mushroom cloud would be 1 5x taller than Castle Bravo and 15x taller than Hiroshima Instead the diagram shows the CB and TB over a thousand times taller On this scale one could conclude that since the Hiroshima bombing s mushroom cloud was about four miles high the Tsar Bomba explosion 3 000x taller must be larger than the Earth itself 98 218 195 90 12 41 6 July 2010