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Old 01-09-2004, 07:55 PM   #1
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Does heat affect specific gravity?

Will specific gravity change with the temperature of the tank?
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Old 01-09-2004, 08:02 PM   #2
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Yes, and most of the plastic swing arm hydrometers are calibrated to a certain degree (most often 77° or so) so this must be taken into some consideration as well.
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Old 01-09-2004, 08:19 PM   #3
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In which direction Hoops? Higher temp = higher SG?
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Old 01-09-2004, 09:18 PM   #4
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http://www.algone.com/salinity.htm
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Old 01-09-2004, 09:25 PM   #5
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holy **** batman...
thx
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Old 01-09-2004, 09:50 PM   #6
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Okay first of all - thanks for the link to the chart!

Second of all - If I keep my tank at 80 degrees (which I do) and I would like my water to be at 1.024 (which I do) then I should shoot for a reading of 1.022 on my plastic hydrometer -- right?


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Old 01-09-2004, 09:58 PM   #7
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wow--------- thats neat i never knew they were calberated at those temps.


Thanks Dewey
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Old 01-09-2004, 10:11 PM   #8
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Second of all - If I keep my tank at 80 degrees (which I do) and I would like my water to be at 1.024 (which I do) then I should shoot for a reading of 1.022 on my plastic hydrometer -- right?
Depends Todd, any idea what your plastic hydrometer is calibrated to? I shouldn't have said "most" in my previous thread...the Deep Sixx I know is calibrated to 77° (at least when I bought it).

IMO, for most hobbyists being in the general range of appropriate s.g. is good enough and it is more important to be stable than anything else (within reason).
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Old 01-09-2004, 10:18 PM   #9
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Thanks for the link, reefrunner.

I noticed that the article states the hydrometer is calibrated for a temperature of 60˚F (15.55˚C). But I have a SeaTest hydrometer, and it says that it's "designed for use in warm water aquariums (68˚-85˚F)." So it seems to me that since this hydrometer is not calibrated to 60 degrees, the table in the article only sort of applies.

Any idea on what the corrections are for the SeaTest hydrometer?
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Old 01-09-2004, 10:25 PM   #10
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Hmm, not sure. However, I too have the Coralife Deep Six Hydrometer so they are probably along the same calibration, I would guess.

We could always fork over $160 for one of those hold-up-to-the-light-and-look-through salinity meters!

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