RT Book, Section
A1 Freeman, Brian S.
A2 Freeman, Brian S.
A2 Berger, Jeffrey S.
SR Print(0)
ID 1102565785
T1 Mechanics
T2 Anesthesiology Core Review: Part One Basic Exam
YR 2014
FD 2014
PB McGraw-Hill Education
PP New York, NY
SN 9780071821377
LK accessanesthesiology.mhmedical.com/content.aspx?aid=1102565785
RD 2024/04/16
AB By  definition,  pressure  (P)  is  the  force  (F)  applied  to  an  object  per  unit  of  area  (A),  such  that  P  =  F/A.  The  SI  unit  of  pressure  is  the  pascal  (Pa);  1  Pa  equals  1  newton  of  force  distributed  over  an  area  of  1  m2.  Pressure  can  also  be  defined  by  other  units,  such  as  millimeters  of  mercury  (mm  Hg),  centimeters  of  water  (cm  H2O),  pounds  per  square  inch  (psi),  or  atmospheres  (atm).  These  different  units  are  based  on  the  specific  way  of  taking  the  measurement.  For  instance,  “mm  Hg”  is  the  pressure  exerted  at  the  base  of  a  1-mm  high  column  of  mercury,  whereas  “cm  H2O”  is  the  pressure  exerted  at  the  base  of  a  1-cm  high  column  of  water  at  4°C.  To  convert  among  the  units,  it  is  useful  to  start  with  the  pressure  of  the  atmosphere  at  sea  level:  1  atm  =  760  mm  Hg  =  988  cm  H2O  =  14.7  psi.