Q: Is the bottom of this flask perfectly flat, both inside and outside? With my current flasks, the stir bar tends to fly off because the inside bottom is somewhat domed.
A: The flasks should have a flat bottom. If the stir bar is being thrown from the bottom, even with a flatter flask, a lrger stir bar, or running the bar at a lower speed, justenought o give agitation would be best. Vortex action in the flask looks great, but the goal is just to keep the soultion moving to continue contant airation