|
Conversion between different data
scales
Temperature
1 °C = 33.8 °F
1 °F = -17.22 °C |
Volume
1 L = 0.26 gal
1 gal = 3.79 L |
Size
1 cm = 0.39 in
1 in = 2.54 cm |
Hardness
1 dH = 17.86 ppm
1 ppm = 0.6 dH |
Water
Hardness
Hardness = the amount of
dissolved salts in water
|
dH
|
ppm or Mg/liter CaCO3
|
Soft
|
0-3
|
0-50
|
Moderately soft
|
3-6
|
50-100
|
Slightly
hard
|
6-12
|
100-200
|
Moderately
hard
|
12-18
|
200-300
|
Hard
|
18-25
|
300-450
|
Very
hard
|
25+
|
450+
|
pH,
Hydrogen power
pH = the concentration of hydrogen ions in water
Acidic
|
Neutral
|
Alkaline
|
+H
|
|
-H
|
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
|
|