"Charles" wrote in message
...
On Tue, 1 Jun 2004 12:29:53 -0400, "NetMax"
wrote:

(snip)

I'd better stop before I'm on a soapbox, and go back to gathering
factual
data, ie:


http://www.fishbase.org/Summary/Spec...me=Carassius&s
peciesname=auratus%20auratus
demersal; freshwater; pH range: 6.0 - 8.0; dH range: 5.0 - 19.0 ;
depth
range - 10 m
climate: subtropical; 0 - 41°C (32-105°F); 53°N - 22°N
Inhabit rivers, lakes, ponds and ditches with stagnant or slow-flowing
water.... They live better in cold water.... Maximum recorded salinity
is
17 ppt, but unable to withstand prolonged exposure above 15 ppt.

So how many ml per litre is 15 ppt (or US teaspoons per US gallon)?


If a liter is 1000 grams, then 15 grams of salt would be 15 ppt, no?

I just weighed some Morton's rock salt, a tablespoon measured from 16
to 19 grams, depending on how it rounded off when I gently shook it.

A US gallon is 3.78533 liters.

A British gallon is 4.5459631 liters ( of maybe liters, in this case.)

Then there is the problem, if we take a liter of water (volume) which
weighs 1000 grams (at some temperature) and add 15 grams of salt, the
mix will now weigh 1015 grams, so we could say that we have 15 parts
per 1015, rather than ppt. I believe the volume will shrink when the
salt is added, that's a memory from way back when.

So, one tablespoon of salt (rock salt) per liter, of 37 tablespoons
for a 10 gallons tank. That's a lot of salt.

Granulated salt comes in about 19 grams per tablespoon in my
weighings. I thought it would be more, that it would pack more
densely than rock salt.

Hain Pure Foods sea salt, for what it's worth. Harder to get back
into the container as well.

So for 5 gallons, Ingrid gets 3 teaspoons and you get 18-1/2 tablespoons
(or 55.5 teaspoons) - but your methology was far more entertaining ;~).
The first sounds very low while the latter sounds quite high (but it's
easy to critique when it's someone else's work).

Assuming both you and Ingrid are in the states, the US teaspoon is 4.93ml
(the UK teaspoon is 3.63ml) and the US tablespoon is 14.79ml (UK
tablespoon is 14.5ml). Five US gallons is 18.93 litres (I'm too old to
be a big fan of metric, but in this case, I think ml and litres will be
our friend ;~).

So that's 14.79ml versus 273.62ml (into 18.93 l), or based on 1000 litres
(to get ppt), thats
..01479 litres x 52.86 = 0.781 ppt
..27362 litres x 52.86 = 14.45 ppt

14.45ppt (if this is correct) works out to 11.1 teaspoons per US gallon.

Charles, your calculation uses a grams to ml assumption, and also I would
think that a salt ppt refers to a liquid concentration, perhaps based on
salt-saturated water at .15%, or perhaps on molecular weights ? *I* have
no idea how to do this properly, and my confidence in your answers is not
being inspired either ;~)
--
www.NetMax.tk

--

- Charles
-
-does not play well with others