Specific Gravity - it is how marine aquarists measure their salt content.
Salt for use in freshwater aquariums
- Thread starter The-Wolf
- Start date
OP
OP
The-Wolf
Ex-LFS manager/ keeper of over 30 danio species
I've had a quick search for converting ppm to SG and I got confused to say the least.
I am in no way shape or form even going to attempt it.
any chemist that can help out here?
I am in no way shape or form even going to attempt it.
any chemist that can help out here?
The-Wolf wow thats a question and a half...
Here is an article describing the relationship:
http
/www.advancedaquarist.com/issues/jan2002/chemistry.htm
Bascially the specific gravity of a sample is a function of its salinity and its temperature.
Here is an article describing the relationship:
http
/www.advancedaquarist.com/issues/jan2002/chemistry.htmBascially the specific gravity of a sample is a function of its salinity and its temperature.
And a table giving a few conversions about 1/5 of the wy down:
http/reefkeeping.com/issues/2004-06/rhf/index.htm
http
/reefkeeping.com/issues/2004-06/rhf/index.htm
Ok I'll try:
First of all density is a measure of how much stuff there is in a certain volume (=mass/volume)
- Suppose you have pure water, this has a particular density.
- You then dissolve some salt in the water. Since salt has a higher density than water the new mixture now has a higher density than the pure water.
- The more salt you add the higher the density of the mixture.
Specific gravity gives you a measure of the density of the mixture compared to the density of pure water, and so gives you a measure of the salinity of the water.
Unfortunatly temperature complicates things and for an explaination the article posted above would probably be the easiest source.
Hope this makes sense.
First of all density is a measure of how much stuff there is in a certain volume (=mass/volume)
- Suppose you have pure water, this has a particular density.
- You then dissolve some salt in the water. Since salt has a higher density than water the new mixture now has a higher density than the pure water.
- The more salt you add the higher the density of the mixture.
Specific gravity gives you a measure of the density of the mixture compared to the density of pure water, and so gives you a measure of the salinity of the water.
Unfortunatly temperature complicates things and for an explaination the article posted above would probably be the easiest source.
Hope this makes sense.
_fish_a_holic_
Fish Fanatic
The reason I asked about specific gravity is, that's what my hydrometer reads. (it's one of those glass ones that have a thermometer on the bottom with a thinner glass tube SG scale on the top) You float it in the water and read off the water line where the SG is.
Are there others out there that read ppm???
Are there others out there that read ppm???
CTS
Fish Crazy
What about salt and live plants i hear that they do not get along well is this correct or false?
_fish_a_holic_
Fish Fanatic
Most live plants, as I understand it...
pica_nuttalli
don't be a twit
BUMP
Yikes! That was frightening. I opted to add 1g/litre (about half the manufacturer's recommendation) to my tank to help knock some fungal infection on the head. Watching the water go in (I diluted the salt in 20 litres of water) made me nervous, as you could clearly see the shimmer of the denser water coming out the siphon hose. It looked like I was adding syrup!
The fish seem quite content though!
Stephen.
The fish seem quite content though!
Stephen.
Dubby
His legend will never die
Paul, How about this ?The-Wolf said:thats a basic descriptionEd4567 said:
is there an even more basic description, one that I can understand?
I doubt it.
[snapback]702075[/snapback]
The specific gravity is directly proportional to the salinity and inversely proportional to the temperature
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