CWFugitt wrote:
At 10:06 PM 5/23/2007, you wrote:
ppm and mg/l are the same.
I doubt that. One is a unit of weight, the other a unit of volume.
This statement sounds like something used in the medical profession.
It is numerically correct. Actually it is mg/kg, but since a kilogram
of water is a liter, then the equation holds.
Where did you learn that? It might be true on some things, but weight
and volume does not make specific amounts or ratios.
It does when you are using water, since 1000 grams is a liter of water
by definition.
No one can say how many mg makes a liter.
Of course you can for water. The DEFINITION of a liter is 1000 grams of
water. Thus from the definition there are 1,000,000 micrograms in a liter.
Try lead, gold, water, ice, ice cream, whipping cream, and
10, 000 other things. All are different of course.
I don't understand. Try what? We are discussing specifically water, all
other substances are irrelevant.
Typically, in most cases, ppm is a weight, 1 to 1 million,
Most calculations are done this way.
That is correct, ppm for something is weight/weight, IE for water it is1
mg/kg of water which equals 1 mg/liter of water.
The unit can be anything, ounces, grams, mg, pounds, tons or whatever.
That is correct as long as you watch your units.
Weight to Volume is doomed to failure and errors.
It is for the English system. But in the metric system when dealing with
water, volume and weight are interchangeable at STP provided you know
the equalities.
Marshall
Wayne
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