Quantcast Atmospheric Pressure - 14221_307

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Atmospheric Pressure,  Continued - 14221_308
Atmospheric Pressure Weight The  layer  of  atmosphere  that  surrounds  us  exerts  a  pressure  of approximately  15  pounds  per  square  inch  at  sea  level.  The  weight  of  the atmosphere  varies  with  the  presence  of  water  vapor  as  well  as  with temperature  and  height  above  sea  level.  Variations  in  atmospheric pressure  are  measured  by  an  instrument  called  a  barometer. Aneroid Barometer The  aneroid  (dry  or  no  fluid)  barometer  (ML-448)  (fig.  10-3)  needs  no correction  except  for  altitude.  It  contains  a  small  metallic  cell,  called  a syphon  cell,  which  encloses  a  partial  vacuum.  As  atmospheric  pressure increases,  the  syphon  cell  contracts;  as  pressure  decreases  it  expands. Figure   10-3.   Aneroid   barometer. As  the  syphon  cell  expands  and  contracts,  it  communicates  motion  to  an indicating  pointer  on  a  graduated  scale. The  aneroid  barometer  (ML-448)  is  graduated  in  inches  of  mercury  and in  millibars  (mb).  Both  inches  and  millibars  are  measurements  of  the weight  of  the  atmosphere  at  a  given  time  or  point.  The  average atmospheric  pressure  at  Earth’s  surface  is  29.92  inches  or  1013.2 millibars. 10-11

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