Alkali halide
NaCl
12.20˚ ± 1.72˚
16.56˚ ± 2.36˚
KCl
16.21˚ ± 2.30˚
18.29˚ ± 3.13˚
KBr
12.98˚ ± 1.52˚
13.25˚ ± 2.28˚