User blog:Therefir/Sandbox

Width of Chair: 6 px = 0.3 m (According to UEFA Stadium Infrastructure Regulations)

Diameter of the explosion: 362 px or 18.1 m

Y = ((x/0.28)^3)/1000

Y is in megatons and x is in km. For our case that's 0.0181 km

((0.0181/0.28)^3)/1000 = 0.0000002701230412 Megatons

That's 0.27012304120000002472 Tons of TNT, or 1130194804.3808000088 Joules.

Only 50% is from the blast, so we half it to get 0.13506152060000001236 Tons of TNT, or 565097402.1904000044 Joules.

Small Building level+