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Table 1 DRH of relevant salts at various temperatures

From: Saturated salt solutions in showcases: humidity control and pollutant absorption

Chemical name

Formula

15 °C

20 °C

25 °C

Calcium chloride hexahydrate

CaCl2‧6H2O

34.1%

30.9%

28.1%

Magnesium chloride hexahydrate

MgCl2‧6H2O

33.3%

33.1%

32.8%

Potassium carbonate

K2CO3

43.2%

43.2%

43.2%

Magnesium nitrate hexahydrate

Mg(NO3)2‧6H2O

55.9%

54.4%

52.9%

Calcium nitrate tetrahydrate

Ca(NO3)2‧4H2O

56.9%

53.7%

50.7%

  1. Data taken from Greenspan [14], for the calcium salts calculated from Wexler [15]