putteesinmyhands said:
I'm trying to calculate the effect on the Earth, but I've come up with a problem. What's 20 billion billion billion megatons in SI units? It's bad enough not knowing if the billion is US (1,000,000,000) or UK (1,000,000,000,000), but when you get a unit repeated more than once, I get confused. I mean, is a trillion a thousand billion or a billion billion?
If someone can help, please hurry as we may not have much time...
A billion has been internationally standardised since the 1960s as 1,000,000,000. So 20 billion, billion, billion megatons is 20,000,000,000 000,000,000, 000,000,000 000,000 tons, or 2 x 10^34 tons (although tons isnât an SI unit).
Hope this helps