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The capacity in ml was then determined using the specific weight of the water which is 0,997 g/ml. The difference between tap water and pure water is below the appreciable limits of the measurement in centigrams, and inessential for the measurement whose accuracy is ±0.02 ml (sum of the systematic error of 0.01 g of the scale in the difference between two measurements, even if the error is always higher for a filled pen weight measurement), for the conversion, however, we can substantially assume an equivalence of 1 g => 1 ml being the difference below the measurement error.  

The capacity in ml was then determined using the specific weight of the water which is 0,997 g/ml. The difference between tap water and pure water is below the appreciable limits of the measurement in centigrams, and inessential for the measurement whose accuracy is ±0.02 ml (sum of the systematic error of 0.01 g of the scale in the difference between two measurements, even if the error is always higher for a filled pen weight measurement), for the conversion, however, we can substantially assume an equivalence of 1 g => 1 ml being the difference below the measurement error.  

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