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Relative humidity (%RH) of several common salts. Relative humidity data from Greenspan19 and Rockland20; saturation data from the International Critical Tables21.
| Salt | Molality @ 20 °C and saturation |
%RH @ 10 °C | %RH @ 20 °C | %RH @ 30 °C |
|---|---|---|---|---|
| Magnesium Chloride Hexahydrate |
5.8 | 33 | 33 | 32 |
| Potassium Carbonate Dihydrate |
8.0 | 47 | 44 | 42 |
| Sodium Bromide | 4.6 | 58 | 57 | 57 |
| Cupric Chloride | 5.6 | 68 | 68 | 67 |
| Sodium Chloride | 6.13 | 75 | 75 | 75 |
| Potassium Chloride | 4.61 | 87 | 86 | 84 |
