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We measured several times (around 10) both the weight when the pen is loaded and when the pen is unloaded, the latter is used to estimate how much liquid remains in the [[feeder]], but we took as an indication of the filling capacity the value with the pen fully filled, because pens are filled once the ink is finished and no longer reaches the nib, and this also includes the one present in the feeder. From the various measurements we obtained average and standard deviation.

We measured several times (around 10) both the weight when the pen is loaded and when the pen is unloaded, the latter is used to estimate how much liquid remains in the [[feeder]], but we took as an indication of the filling capacity the value with the pen fully filled, because pens are filled once the ink is finished and no longer reaches the nib, and this also includes the one present in the feeder. From the various measurements we obtained average and standard deviation.

Si è poi determinata la capacità in ml utilizzando il peso specifico dell'acqua che è 0,997 g/ml. La differenza fra acqua di rubinetto e acqua pura è al di sotto dei limiti apprezzabili della misura in centigrammi, ed inessenziale per la misura la cui precisione è di ±0,02 ml (somma dell'errore sistematico della bilancia per la differenza fra due misure, di 0,01 g), per la conversione comunque si può sostanzialmente  assumere una equivalenza di 1 g => 1 ml essendo la differenza al di sotto dell'errore di misura.  

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 the balance for the difference between two measurements, of 0.01 g), 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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