1000 m. of pure water = 100 bar plus atmospheric pressure at say 1 bar = 101 bar.
Seawater will be more because the density is higher.
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After M (1000), a bar is placed on top of the base numeral to indicate that it is multiplied by 1000. In this case, an X with a bar on top of it is 10*1000 equals to 10000 and a V with a bar on top of it is 5*1000 equals to 5000. Therefore, 15000 is equal to : XV with bars on top of each.
10m (10,000 mm) of water column is about 0.98 bar (P=density*specific gravity*height=1000*9.8*10) 5000 mm WC is 0.49 bar then.
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The numeral M (1000) with a horizontal bar above it to denote multiplication by a thousand. Thus 1000 times 1000 equals 1000000. Enclosing symbols in brackets also denotes that the enclosed symbols should be muliplied by 1000. This is used for numbers above 3000 = MMM, so 4000 can be written as (IV) 4 x 1000. A million can therefore be written as (M) 1000 x 1000.
(1 percent) bar = 1000 pascals