An ohm per square depends on the effective area of a sheet. Let us look at a sheet that is W um by L um. A square is a calculation which answers how many squares of size min(W,L) by min(W,L) are in an area.
In other words how many squares are in an area defined by W and L is max(W or L) divided by min(W or L).
The number of microns would require multiplication by at least 1 dimension.
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14 grams per micron
To convert microns to grams per square meter (GSM), you can use the general conversion factor where 1 micron is approximately equal to 1.48 GSM for paper. Therefore, 50 microns would be roughly 74 GSM (50 microns × 1.48 GSM/micron). Keep in mind that this is an approximation and actual GSM can vary depending on the material.
You have to divide by a trillion. So x g/m2 is 0.000000000001x g/um2
A micron is a measure of length and a cubic meter is a measure of volume, thus the two can not be equated.
To convert microns to grams per square meter (gsm), you can use the fact that 1 micron is approximately equal to 1 gsm for materials with a density of 1 g/cm³. Therefore, 75 microns would be roughly equivalent to 75 gsm for materials with that density. However, the actual gsm can vary depending on the material's specific density.