Abstract
The uncertainties in measuring the volume of a liquid in a pcynom-eter are largely overcome if the pycnometer is filled just full, as determined by reflecting light from the meniscus of the filling liquid when the meniscus is flat across the top of the pycnometer. For a large pycnometer other factors than volume may be of major importance, but for a micro-pycnometer, reproducibility of volume, and accuracy of weighing are the chief considerations.
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