None. "square meter" is a unit of volume and "ton" is a unit of mass.
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Divide by 9.81
A tonne is a unit of mass; a square meter is a unit of area. You only "convert" units of the same kind.
1.69 tons
The atmospheric pressure is roughly 1 bar, or 100,000 pascal. That means 100,000 newton per square meter (equivalent to the mass of about 10 tons). Actually, that's the approximate pressure at sea level; the pressure (force or weight per square meter) varies a lot depending on the altitude.
2.2 tons.