A method and system for location determination and guidance using radio frequency identification are disclosed. When the wheel is in the stopped condition, a braking moment derived from the unbalance measurement result and applied by a holding brake is caused to act on the wheel so that the wheel is prevented from rotating of its own accord by virtue of its static unbalance. According to the object which is set, the bodies according to the invention are intended to be able to separate components out of gas mixtures over longer periods of time with an approximately constant performance.