“…12 Much work has investigated the effect of ambient RH once. 9,10,[13][14][15][16][17][18] However, existing studies significantly disagree about the effect of RH on CE: some results show that CE increases with increasing RH, 9 others show that CE decreases as RH is increased, [14][15][16][17] and more still state as RH increases, CE increases at lower RH, followed by decreases at higher RH. 18 In addition, the results of Refs.…”