Backyard Aquaponics
A place to discuss aquaponics

parts per 1000 PPT is an easy equasion 1PPT = 1g salt per litre

Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5%, or 35 parts per thousand. This means that every 1 kg of seawater has approximately 35 grams of dissolved salts (mostly, but not entirely, the ions of sodium chloride: Na+, Cl-). The average density of seawater at the surface of the ocean is 1.025 g/ml; seawater is denser than fresh water (which reaches a maximum density of 1.000 g/ml at a temperature of 4°C) because of the added weight of the salts and electrostriction.[1] The freezing point of sea water decreases with increasing salinity and is about -2°C (28.4°F) at 35 parts per thousand. [2]

C1 get off the sauce and do that ist line again

almost bowed my head in deep, deep, deep shame, Rupert
but:
"Seawater has a salinity of roughly 35,000 ppm, equivalent to 35 g/L."
http://en.wikipedia.org/wiki/Saline_water
and
"On average, seawater in the world's oceans has a salinity of about 3.5%, or 35 parts per thousand"
http://en.wikipedia.org/wiki/Seawater
does not conflict

so you are right
and I am too
as 35 ppt = 35000 ppm

the confusion arises from using acronyms (which I admit I have initiated)
and sorry, sorry, sorry

that is why I changed PPT (Parts Per Total) to PPV (Parts Per Volume)
might be even better to change this to WPV (Weight Per Volume) to describe a certain amount of product added to a certain volume of water

I was lucky to have used capitals
which might get me off the hook
but I admit that wasn't intended

maybe I am complicating things unnecessarily
please help me out

Frank

Ooops MODS please

Looks like my refractometer is wrong the water at williamstown beach reads 36 ppt

Though they are the same we have NEVER used PPM ONLY PPT

Not bad though F&F

FROM GOOGLE Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5%, or 35 parts per thousand. This means that every 1 kg of seawater has approximately 35 grams of dissolved salts (mostly, but not entirely, the ions of sodium chloride: Na+, Cl-). The average density of seawater at the surface of the ocean is 1.025 g/ml; seawater is denser than fresh water (which reaches a maximum density of 1.000 g/ml at a temperature of 4°C) because of the added weight of the salts and electrostriction.[1] The freezing point of sea water decreases with increasing salinity and is about -2°C (28.4°F) at 35 parts per thousand. [2]

That's the beauty of maintaining consistently accepted definitions.... ppt is parts per thousand...

Redefining it as PPT (parts per total) is just unnecessarily confusing....

A bit like trying to change the name of chift pist to something else

I agree, and I have already amply apologized for it
and I have suggested to change that to WPV for which to my knowledge no alternative exists related to AP or aquaculture

but so is confounding capitals PPT with low case ppt and capitals PPM with low case ppm (which is the norm)
as some seem to do

Frank

What like...ummm,.,..,. CHOP ??

Being a bit picky aren't u Frank ppm can be emphasized by typing PPM
but it doesn't change the meaning if that is what your getting at!

Comon C1... everybody knows that an "orange" isn't an "ORANGE"....

Especially when we choose to redefine it as a "non-green citric fruit"...

FFS or quietly ffs

it's about conventions and avoiding confusion
ppm in scientific books to my knowledge is always written in lower case

call that picky if you want

frank