Table 2.

Water activity (a_w) values in perchlorates salt solutions.

NaClO4	aw	KClO4	aw	Mg(ClO4)2	aw	Ca(ClO4)2	aw	T (°C)	**g/Kg
5	0.928	5	0.934	5	0.936	5	0.932	17.6	24
50	0.929	50	0.932	50	0.934	50	0.933	17.6	24
150	0.929	80	0.93	70	0.934	100	0.934	17.6	24
190	0.933	90	0.927	80	0.937	160	0.932	17.6	24
200	0.933			100	0.94	170	0.925	17.6	24
210	0.932			120	0.94	180	0.931	17.6	24
220	0.933			130	0.94	190	0.934	17.6	24
230	0.935			140	0.937	200	0.932	17.6	24
				145	0.937	210	0.934	17.6	24
				150	0.936			17.6	24

^*Concentrations are expressed in millimolarity (mM).

^**g/Kg ratio indicates the amount of water in the sample.