Answer:
The Pascal is a unit of pressure = one newton per square meter
the square millimeter (mm^2) is a unit of area.
I'm guessing that you want to know the pressure of one newton over 100 square millimeters.
1 square meter = 1,000 mm by 1,000 mm = 1,000,000 square mm.
So the area would be 100 / 1,000,000 = 1 / 10,000 or
one ten thousandth of a square meter.
That makes the pressure equal to .0001 newtons / square meter.
You wanted to know the ratio?
One newton per square meter has 10,000 times the pressure than if it were just one newton over 100 square millimeters.
Explanation: