Modifiche

The measurements have been carried out using a scale with sufficient precision, capable to appreciate the hundredth of a gram (of those for weighing gold and jewellery, that you can find for about ten euros on the internet). To give an idea of the order of magnitude, a drop of water from a dropper is between 2 and 4 centigrams.

The measurements have been carried out using a scale with sufficient precision, capable to appreciate the hundredth of a gram (of those for weighing gold and jewellery, that you can find for about ten euros on the internet). To give an idea of the order of magnitude, a drop of water from a dropper is between 2 and 4 centigrams.

First the pen was weighed completely empty, washed and left to dry completely so as to avoid any residue due to liquid remaining in the [[feeder]]. Left to dry completely means holding the pen upside down with the nib resting on a sheet of absorbent paper for at least a week (actually, probably one day is enough), so as to exclude any residual water.

First the pen was weighed completely empty, washed and left to dry completely so as to avoid any residue due to liquid remaining in the [[feeder]]. Left to dry completely means holding the pen upside down with the nib resting on a sheet of absorbent paper for at least a week, so as to exclude any residual water.

Then the pen has been filled with tap water. For a comparison that takes into account the liquid remaining in the feeder, the weight was measured several times starting from the first filling of the empty and dry pen, repeating the loading and unloading cycles.

Then the pen has been filled with tap water. For a comparison that takes into account the liquid remaining in the feeder, the weight was measured several times starting from the first filling of the empty and dry pen, repeating the loading and unloading cycles.