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http://indianaquariumhobbyist.com/community/ :: View topic - Weight of Salt Water
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Weight of Salt Water

 
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rajeev
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PostPosted: Thu Aug 04, 2005 12:39 pm Post subject: Weight of Salt Water Reply with quote

 Could  somebody  tell  me  as  to  what  could  be  the  weight  of  Salt  Water  per  gal  or  per  lit
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Madan
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PostPosted: Thu Aug 04, 2005 1:02 pm Post subject:  Reply with quote

 Sea  Water  weighs  1.025  Kg  per  liter.
 
 Salt  water  can  weigh  anything  depending  on  the  amount  of  salt  dissolved.
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ApurvaP
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PostPosted: Thu Aug 04, 2005 4:57 pm Post subject:  Reply with quote

 Talking  about  the  salinity  we  maintain  in  our  aquariums.  What  could  be  the  weight  of  saltwater  per  liter  then?
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Madan
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PostPosted: Thu Aug 04, 2005 5:07 pm Post subject:  Reply with quote

 Apurva,
 
 What  is  the  density  of  the  salt  water  you  maintain  in  your  aquarium?
 
 Do  you  measure  the  density  or  the  salinity?
 
 You  are  supposed  to  maintain  a  density  equal  to  the  density  of  sea  water  in  your  aquarium.
 
 If  you  skip  on  the  salt  look  at  the  densometer  and  you'll  know  the  weight  of  your  water  per  liter.
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joyban
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PostPosted: Thu Aug 04, 2005 9:39 pm Post subject:  Reply with quote

 Density  =  mass  /  volume
 The  density  of  water  is  1  gram/cm3  since  water  was  used  as  an  early  mass  standard,  one  gram  being  informally  defined  as  the  mass  of  1  cm3  of  water.
 
 Specific  gravity  is  the  weight  ratio  (expressed  decimally)  of  two  equal  volumes  of  the  substance  and  a  standard
 
 Specific  Gravity  =  weight  of  substance  /weight  of  equal  volume  of  standard  
 Standards  are  
 ---  water  for  solids  and  liquids
 ---  hydrogen  or  air  for  gases
 
 So  the  specific  gravity  of  water  in  our  tanks  is  therefore  the  ratio  of  the  density  of  that  water  at  a  specific  temperature  to  the  density  of  pure  water  at  a  specific  temperature.  It  seems  simple  enough,  but  as  we  go  further  it  gets  more  complicated.  
 
 The  density  of  a  substance  is  the  volume  that  a  certain  mass  occupies.  Or,  to  put  it  another  way,  it  is  the  mass  of  a  certain  volume  of  the  substance.  
 
 Generally,  as  liquids  and  gases  are  heated  they  expand,  and  when  they  are  cooled  they  contract.  The  density  will  therefore  decrease  with  increasing  temperature  and  increase  with  decreasing  temperature.
 
 So,  if  temperature  affects  density,  does  it  also  affect  specific  gravity.
 
 So  a  floating  glass  hydrometer    will  give  you  the  specific  gravity  reading,  the  specific  gravity  of  natural  seawater  (S  =35)  is  1.0278  using  the  3.98  Â°C  standard.  Also  specific  gravity  of  natural  seawater  can  varry  from  region  to  region  like  Red  sea  comp.  to  Indian  Ocean.
 
 For  more  reading  &  reference  please  visit  http://www.advancedaquarist.com/issues/jan2002/chemistry.htm
 
 Reef  water  Aquarium  Refer  to  http://www.reefaquariumguide.com/reef/Concepts/water.htm
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