| I | Quantitas materiae est mensura ejusdem, orta ex illius densitate et magnitudine conjunctim. |
La quantita' di materia e' misura di essa, sorta dalla di lei densita' e magnitudine congiuntamente. |
| The quantity of matter is the measure of the same, arising from its density and magnitude [volume] conjunctly. | ||
| II | Quantitas motus est mensura ejusdem, orta ex velocitate et quantitate materiae conjunctim. |
La quantita' di moto e' misura di esso, sorta da velocita' e quantita' di materia congiuntamente. |
| The quantity of motion is the measure of the same, arising from the velocity and quantity of matter conjunctly. |
1. Thus air of a double density, in a double space, is quadruple in quantity; in a triple space, sextuple in quantity. The same thing is to be understood of snow, and fine dust or powders, that are condensed by compression or liquefaction; and of all bodies that are by any causes whatever differently condensed. I have no regard in this place to a medium, if any such there is, that freely pervades the interstices between the parts of bodies. It is this quantity that I mean hereafter everywhere under the name of body or mass. And the same is known by the weight of each body; for it is proportional to the weight, as I have found by experiments on pendulums, very accurately made, which shall be shewn hereafter.
2. The motion of the whole is the sum of the motions of all the parts; and therefore in a body double in quantity, with equal velocity, the motion is double; with twice the velocity, it is quadruple.
| Ejusdem | rob: ejus-dem esso-di, di esso. eiu stesso ejus = eius = egli = ess-o/a = lui; dem = di; ejus-dem = esso(di). Of the same, Ibidem, del-la medesim-o/a, istesso, |
| orta | |
Quantitas materiae est mensura ejusdem.
Quantitas motus est mensura ejusdem.
La quantita' di materia e' la misura della materia.
La quantita' di moto e' la misura del moto.
Rob: bisogna sapere se e':