A gsm is a measure of mass per unit area while a micron is a measure of length or distance. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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1gsm=0.14micron 178gsm=24.92 micron
150 GSM
It depends on the density per unit area.
You cannot. gsm, or grams per square metre, are a measure of the mass of a unit area of paper (usually). There is no simple relationship between this measure and the thickness of the paper - which would be measured in microns.
150