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In Roman numerals, M with a bar over it stands for one million and it can also be expressed as (M) meaning 1,000*1,000 = 1,000,000
meters.
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.
Michael (Mac) Voisin and Mark Nowak
"m" stands for slope