What is the total volume of water that precipitates across the entire globe?
Okay, I’m assuming annual global rainfall is 1050mm/yr and I’m assuming that the surface area of the Earth is 510,072,000 km². There’s a lot of conversion going on here and a lot of zeroes, so hold onto your hats. A millimeter of rainfall is a measure of height of water that falls across a square millimeter, so by volume, it’s 1mm³ of water (1 mm² area times 1 mm in height). There are 1,000 mm³ in 1 cm³, and one cm³ is 1 milliliter (ml), so an average of 1.050 ml falls per every mm² on earth (1.050ml/mm²). Next, as was said before, that’s only the volume of water that falls on the average square millimeter of the planet.We have to multiply this by the surface area of the earth, but we need to convert from km² into mm². There are 1,000,000 m² in 1 km² (we’re converting 1000 meters to 1 km twice because we’re talking about area) and 1,000,000 mm² in a m², so we need to multiply 510,072,000 km² by 1 trillion (1 million times 1 million) to get the surface area of earth in mm². That comes o
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