2006-09-17 23:51:45 · 8 answers · asked by Roxy 1 in Science & Mathematics ➔ Chemistry
Grains of hardness: A “grain” is a water filtration industry measurement equal to about 17.1 parts per million, or 17.1 milligrams per liter
2006-09-17 23:53:18 · answer #1 · answered by just browsin 6 · 1⤊ 0⤋
hardness of water is due to dissolved Ca and Mg salts in it. so the concentration of these salts gives one an idea of the hardness. for practical purposes, this concentration is expressed in parts per million (ppm).
2006-09-18 09:05:21 · answer #2 · answered by pranav 2 · 0⤊ 0⤋
Hardness of any physical material is measured in linear quantity. Its dimension is M and unit is meter in S.I system of Units.
2006-09-18 06:58:09 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Do you live in America?
It's grain per gallon there.
2006-09-18 06:53:57 · answer #4 · answered by Anonymous · 0⤊ 0⤋
as hard as it may get
2006-09-18 07:00:14 · answer #5 · answered by Anonymous · 0⤊ 0⤋
if I'm not wrong check out the site
http://www.drhelm.com/aquarium/chemistry.html
2006-09-18 06:59:15 · answer #6 · answered by Anonymous · 0⤊ 0⤋
When are you going to do your own homework?
2006-09-18 06:52:46 · answer #7 · answered by Anonymous · 0⤊ 0⤋
ice?
2006-09-18 06:52:56 · answer #8 · answered by Anonymous · 0⤊ 0⤋