Tuesday, 11 August 2015

PRESSURE

PRESSURE

DEFINITION 

  •   It  is  the  force  applied  perpendicularly  to  the  surface  of  an  objects  per  unit  area  over   which  that  force  is  disturbed .
  • Various   units  are  used  to   excess  pressure.
  • SI  unit  of  pressure  is  pascal 
  • Pressure  may  be  expressed  in  terms   of   standard   atmospheric  pressure.  The  atmosphere  is   equal   to   the   pressure.










FORMULA


P =  F/A

  Where   p  is  pressure  
                f  is  force 
                a   is  area
  
  Pressure   is  a   scalar  quantity. 








UNITS

  • The SI unit  of  pressure  is  pascal,  equal  to  one  newton  per  square  meter.
  • The  CGS  unit  of  pressure  is  BARYE(ba),  equal  to  0.1 pa
  • Sometimes  pressure  express  in  gram  force  or  kilogram.


EXAMPLES


  • A  finger  can  be  pressed  against    the  wall   without  making  any  lasting  impression.
  • Pressure  is  transmitted   to  solar  boundaries  of  fluid  normal   to  these  boundaries  or  section  at  every  point.
    

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