Saturated Salt Solutions and Air Humidity
A salt solutions can be used maintain a particular value of relative humidity
A saturated solution of salt in water can be used to maintain particular values of relative humidity inside containers and can be used to calibrate humidity sensors.
A saturated salt solution is made up as a slushy mixture with distilled water and a chemically pure salt.
Saturated Salt Solution | Temperature (ºC) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 50 | 60 | |
Relative humidity (%) | |||||||||||
Ammonium nitrate | 75 | 70 | 67 | 64 | 60 | 53 | |||||
Ammonium sulphate | 82 | 82 | 82 | 82 | 81 | 81 | 81 | 80 | 80 | 79 | |
Magnesium chloride | 34 | 34 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 29 |
Magnesium nitrate | 60 | 59 | 57 | 56 | 54 | 53 | 51 | 50 | 48 | 45 | |
Lithium chloride | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
Potassium sulphate | 99 | 98 | 98 | 98 | 98 | 97 | 97 | 97 | 96 | 96 | |
Potassium nitrate | 96 | 96 | 96 | 95 | 95 | 94 | 92 | 91 | 89 | 85 | |
Potassium chloride | 89 | 88 | 87 | 86 | 85 | 84 | 84 | 83 | 82 | 81 | 80 |
Potassium acetate | 23 | 23 | 23 | 23 | 22 | ||||||
Potassium hydroxide | 14 | 12 | 11 | 9 | 8 | 7 | 7 | 6 | 6 | 5 | |
Sodium chloride | 76 | 76 | 76 | 76 | 75 | 75 | 75 | 75 | 75 | 74 | 75 |
Sodium nitrite | 65 | 64 | 63 | 62 | 61 | ||||||
Sodium dichromate | 61 | 59 | 57 | 57 | 55 | 54 | 53 | 51 | 50 | 49 | 47 |
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