Measurement of Pressure

1. Atmospheric PressureBarometer
2. Force per unit area is called pressure                              
   Units: Pa(= N/m2), psi(=lbf/in2), bar (=105 Pa=100 kPa), mbar (=100 Pa=1 hPa),
   atm (=101.3 kPa), mmHg (or Torr), inHg, etc.
   Note: For every Unit: hUnit=hectoUnit=100 Unit
   Pabs = Patm + Pgage
     Where Pabs : Absolute pressure
                  Patm : Atmospheric pressure
             (standard is: 101.3 kPa =14.696 psi=760 mmHg=29.92 inHg)
                  Pgage : Gage pressure