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It's a Physics question, post it else where.
Joking, even thought it's not a Math question, but we will help you.
The answer is: No one knows!
Pressure P = F/A where
F is the Force applied
A is the area of the object applying the force
so let's say the pressure of a 1kg thing apply weight force (gravitational) on the ground through a surface area of 1 cm ^2
Then P = F / A = mg / A = 1 kg x 10 N / kg x 1 / .01 m^2 = 1000 N
Now suppose it's the same object, same mass, but area is 1m ^2
Then
P = 1 kg x 10 N/ kg x 1/1 m^2 = 10 N
Both object is 1kg, but pressure is very different.
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