Wednesday 14 September 2011

PRESSURE


Pressure is the force acting on a surface per unit area in a direction perpendicular to it. It is
a scalar quantity and its SI unit is N / m2 named pascal ( Pa ) in honour of the French
scientist Blasé Pascal. Its dimensional formula is M 1 L - 1 T - 2. Thus,
Pressure, P ( Pa ) = Force, F ( N ) / Area, A ( m )
A bigger unit of pressure is ‘bar’. 1 bar = 10 exp5 Pa
1 atmosphere pressure ( atm ) = 1.013 × 10exp5 Pa or N /m2 = 760 mm ( 76 cm ) of Hg column.

No comments:

Post a Comment