Unit of Pressure - $\frac{N}{m^2}$ or $\frac{kg}{cm^2}$ I am came across Pressure being given with unit $\frac{kg}{m^2}$ at a lot of technical papers I am reading. 
However, as far as I understand, Pressure is defined as $\frac{N}{m^2}$ which is not same as $\frac{kg}{m^2}$. 
Can you please clarify if I am going wrong somewhere?
 A: Technically, pressure is better defined as force per unit area, without any specific units in mind.
But your confusion is justified.  Pressure should be measured in units of force per area, in metric, we typically use Pascals ($Pa$) which are given by $\frac N{m^2}$.  
$\frac {kg}{m^2}$ is not a measure of pressure, so your reasoning seems solid to me.  Besides in some specific cases where pressure would scale linearly with mass, I don't think it makes a lot of sense to refer to pressure in $\frac {kg}{m^2}$.  You are right to question it, calling that pressure is confusing at best.
Odds are they were actually talking about kilogram-force per metre squared.  That would be a measure of pressure, but typically you would write $kg_f$ or $kgf$ to distinguish it from the unit of mass, $kg$.  Pressure as $\frac {kg_f}{m^2}$ would make sense.
A: Mathematically pressure is defined as force per unit area:
$$ p = \frac{F}{A} $$, if the only force which is acting on area is weight then we can extend expression according to second Newton law as:
$$ p = g\frac{m}{A}$$, so because $g$ is constant we can consider a pressure as a mass per unit area as well.
A: Check your sources for the exact terms they are using for kg. It is possible they are referring to kilogram-force as opposed to kilogram-mass. According to Wikipedia kilogram-force is a gravitational metric unit of force. It is equal to the magnitude of the force exerted on one kilogram of mass in a 9.80665 $\frac{m}{s^2}$ gravitational field.
Hope this helps.
