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what kind of salt do you use ? | 10 comments (10 topical, 0 editorial, 0 hidden)

Re: This is a first time post, so I will vote for (none / 0) (#3)
by Scott Lockwood on Thu Mar 29, 2007 at 05:49:09 PM PST

A specific gravity of 1.02 is better than higher salinities

Wow, really? That's interesting, did you know that the normal range for specific gravity of human urine is 1.005 to 1.030. 1.020 is right in the middle of that range.

"I love to visit PetSmart's Tropical Fish Dept. to see what new diseases are around today." -- inkmaker
[ Parent ]

Ah! You made me double check. :) (none / 1) (#4)
by unclescott on Thu Mar 29, 2007 at 08:51:29 PM PST

"Because of salinity and temperature variations, the density of seawater ranges from about 1.02 g/cm3 to 1.03 g/cm3." Glencoe Earth Science. Ohio: McGraw Hill, 2002: 395.

I have heard that the average salinity of human blood is very close to see water. Because of other cells, plasma and stuff in the blood I know nothing about, its overall specific gravity is 1.06.

That urine has a higher specific gravity than seawater sometimes - and most freshwaters virtually all of the time - might be because one's body is trying to get of a bunch of extra minerals, ammonia, etc.

Then we get into the whole issue of why marine fish drink water (they all ready have plenty of minerals and are trying not to get to too low a water level in their bodies). Freshwater fish need more mineral salts (more calcium and magnesium and potassium than sodium) and have developed ways to expel extra water from their systems. That will have to be another (yawn) time.

[ Parent ]

what kind of salt do you use ? | 10 comments (10 topical, 0 editorial, 0 hidden)

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