I'm not sure if this is the plaec to ask, but I'm having some trouble weighing some glassware. This glassware has been cleaned very well and kept in a dessicator. Whenever I weigh it on our analytical balance, the mass continues to decrease. The rate of this decrease slows after a few minutes, but the mass is still in a decreasing mode. Our balance is in good working order, and this problem is not experienced with anything else measured. We think the problem might be related to static or humidity or barometric pressure, though, we're not sure. Does anyone have any ideas? I would be very grateful.