+129852 I recently provided an answer to this question (660,000,000 km3) and was - rightly - scourged by some fellow posters. Melody and "Anonymous" seemed particularly "muley' in their responses to my answer- again, I humbly apologize. I see, now, that I provided only a partial answer - an oversight which I will attempt to correct.
Taking my assumed partial answer and converting it to cubic meters, we have
6.6 x 1017 m3
And using another - more reliable - source than those dolts at NOAA (from whence my first answer proceeded), I have found that there are approximately 264 US gallons of water contained in a cubic meter. The British- apparently- only have 219 of their gallons contained in a cubic meter. I suspect that their cubic meter has, in fact, sprung a leak somewhere along the line....perhaps it occured at Waterloo, or maybe, while they were in the loo. Well......no matter...that's their problem if they can't hold their water.
So, anyway.......mutiplying 6.6 x 1017 m3 by 264 gallons, we get 1.7424 X 1020 gallons of water contained by the Pacific Ocean. However.....
This answer doesn't go far enough. It WOULD be complete, EXCEPT for one thing.....we have forgotten that some of the space in the Pacific is occupied by by the fish population......how much isn't exactly known, but to be on the safe side, I have conservatively added a "fish coefficient" to my answer. I estimate that the coefficient, represented by this symbol - ∝ - reduces the volume by a good 5% (or so), so that my final answer is 1.65528 X 1020 gallons ± 219 gallons. This final appendage of 219 is just to placate our friends in the UK. Mostly, it's statistically insignificant.
I realize that the original poster wanted the units expressed in something called "Imperial Minims." It is with regret that I must inform that poster that this unit of measurement has been supplanted by something called the "Sagan Sheppey." The exact volume of this hasn't been precisely determined due to political foot-dragging......Hey, why do you think they call it the Bureau of "Waits" and Measures??? Anyway, not to be presumptuous, but this questioner appeared to be a UK citizen. And I figure that if he/she can stand a little water leakage from their cubic meter, then a few "Imperial Minims" won't be missed, either.
Well.......that's all, for now.........I'm on a contract job with Sisyphus, at the moment......something about a missing zero in a boulder.........progress seems to be "up and down"
Your Humble Math Sleuth,
CPhill
