Volcanic ash grains pick up up to ten times less triboelectric charge as relative humidity rises from 0% to 50%, and charge also drops with increasing temperature at fixed humidity.
Charging device consists of a hollow aluminum tube open at one end and connected to the grounded shaft of a stepper motor at the other
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Microphysical effects of water content and temperature on the triboelectrification of volcanic ash on long timescales
Volcanic ash grains pick up up to ten times less triboelectric charge as relative humidity rises from 0% to 50%, and charge also drops with increasing temperature at fixed humidity.