UTC   I agree with  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 artistdrawn D images with the height of 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  times larger in volume or x 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 x taller than Castle Bravo and x 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 bombings mushroom cloud was about four miles high the Tsar Bomba explosion x taller must be larger than the Earth itself      July