Mass determination in the gravitational field covers a wide measuring range and, as a comparative method, facilitates very sensitive measurements. However, gravity is a very weak force. First by application of acceleration fields and with mass spectrometric methods, the measuring range could be extended towards atomic and sub-atomic masses. There are only practical limits of weighing heavy masses. The mass of celestial objects can be determined by means of Kepler’s Laws.
 J.A. Poulis and J.M. Thomas, Sensitivity of analytical balances and relevance of fluctuation theory, [in:] Vacuum Microbalance Techniques. Vol. 3, (K.H. Behrndt, Ed.), Plenum Press, New York, pp. 1-14, (1963).
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