Quotation

What If?

Serious Scientific Answers to Absurd Hypothetical Questions
And the author's math checked out unlike Lee Child's Jack Reacher books: We’ll imagine our storm measures 100 kilometers on each side and has a high TPW (total precipitable water) content of 6 centimeters. This means the water in our rainstorm would have a volume of: 100km x 100km x 6cm = 0.6km^3 That water would weigh 600 million tons (which happens to be about the current weight of our species).