Table 1 List of saturated solutions used at different temperatures to achieve the required relative humidity
Saturated salt solutions | Relative humiditya | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
5 °C | 10 °C | 15 °C | 20 °C | 25 °C | 30 °C | |||||||
Expected | Actual | Expected | Actual | Expected | Actual | Expected | Actual | Expected | Actual | Expected | Actual | |
Sodium chloride + potassium chloride | 70 | 64.9 ± 0.61 | 70 | 66.8 ± 0.8) | ||||||||
Sodium chloride | 75 | 77.1 ± 0.62 | 75 | 62.1 ± 0.47 | 75 | 66.8 ± 1.18 | 75 | 63.3 ± 0.58 | 75 | 73.9 ± 0.56 | 75 | 72.9 ± 0.6 |
Potassium bromide | 85 | 83.4 ± 0.48 | 85 | 66.3 ± 0.71 | 85 | 63.9 ± 0.71 | ||||||
Potassium chloride | 85 | 83.6 ± 0.98 | 85 | 84.6 ± 0.17 | ||||||||
Potassium nitrate | 95 | 92.4 ± 1.86 | 95 | 95.5 (± 0.86) | 95 | 93.9 ± 0.1.53 | 90 | 87.8 ± 1.2 | 90 | 81.6 ± 2.01 | ||
Potassium sulphate | 99 | 64 .7 ± 0.50 | 99 | 96.4 ± 0.45 | 99 | 96.4 ± 2.56 | 99 | 85.6 ± 1.58 | 95 | 67.5 ± 1.82 | 95 | 72.9 ± 1.60 |
Potassium dichromate | 99 | 97.6 ± 0.23 | 99 | 98.8 ± 1.80 | ||||||||
Sodium nitrite | 65 | 65 | 65 | |||||||||