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Typical instruments for the measurement of the density of a liquid may not be used in microscale experiments efficiently and satisfactorily. Although a few methods to determine the density of a liquid at the microscale level have been developed, these methods can determine the density to only two significant figures.To improve the precision and accuracy in measuring the density of a liquid at the microscale level, a capillary with a volume of about 30 µL and two pinhole ends has been designed. The density determined by this capillary method is precise to four significant figures.
According to the practice operation, the accuracy of the density determined by the capillary method is not significantly different from the vibrational desitometer method. The range of the standard deviation that is represented the precision of the capillary method is from 0.00173 to 0.00351 gcm-3 The range of the relative error of the density is from -0.63% to +0.58%.
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