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Pressure = force / area.

But:

force = mass * acceleration due to gravity.

>

Force:

Say 1 kilogram mass at earth gravitational acceleration (9.8 (m/s)/s)

= 1 * 9.8 = 9.8 newtons

>

Say area it acts on = 0.01 square metres

>

Pressure = 9.8 / 0.01 = 980 pascals (0.142 psi)

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