Table 1
Water activity values of saturated salt solutions at different temperatures

Salt	Water activity				Δ H1) (kJ/mol)
	10℃	20℃	30℃	40℃
	MgCl2	0.35	0.34	0.31		0.31	3.65
NaBr	0.61	0.6	0.56	0.56	4.82
NaCl	0.77	0.75	0.73	0.73	5.59

Net isosteric heat of sorption.