Re: Converting mg/L to ppm?
To: Aquatic Plants Digest <Aquatic-Plants at actwin_com>
Subject: Re: Converting mg/L to ppm?
From: Bill Warner <lww at ictech_com>
Date: Sat, 20 Jul 1996 21:33:51 -0500
In-reply-to: Your message of "Sat, 20 Jul 1996 14:25:04 EST."
> Also, remember that pure water at standard temperature and pressure weighs
> one gram per cubic centimeter.
Close, but not quite. Did you really mean to say "standard temperature and
pressure"? Standard temperature and pressure (STP) is 0 C and 1 atm. At 0 C
the density of water depends on whether it is liquid or frozen. There is a
Actually, the density of water comes closest to 1 g/cc at 3.98 C. This is
waters point of maximum density. The density of pure, air free water at
3.98 C is 0.999972 g/cc.
However, I doubt anyone on the list really cares about such trivia. So, for
practical aquarium purposes, we can consider the the density of water to be
1.0 g/mL, and mg/L equivalent to ppm.