(A) The $SI$ unit of pressure is the pascal (represented as $Pa$),which is defined as one newton per square metre ($N/m^2$ or $kg \cdot m^{-1} \cdot s

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(A) The $SI$ unit of pressure is the pascal (represented as $Pa$),which is defined as one newton per square metre ($N/m^2$ or $kg \cdot m^{-1} \cdot s^{-2}$).This unit was officially adopted in $1971$.Before this,pressure in the $SI$ system was expressed as $newtons$ $per$ $square$ $metre$.