A Percentage mass change between 5 days premolt and anterior ecdysis for Armadillidium vulgare maintained in 100 % RH (blue) and 97 % RH (red) and plotted as a function of premolt mass. Trendlines show best-fit logarithmic curves. Animals in 97 % RH achieve slightly smaller proportional mass changes to those in saturated air, consistent with the reduced vapor pressure gradient for WVAB Log-log plot showing the relationship between fractional mass-gain and pre-molt mass in 100 % RH (% mass gain α M-0.676).