. The philosophical works of the Honourable Robert Boyle esq.: abridged, methodized, and disposed under the general heads of physics, statics, pneumatics, natural history, chymistry, and medicine. a pair of bellows, or with human** breath, is heavier than when flaccid, I will not deny, becaufe of the* greater quantity of atoms, or of fuliginous corpufclss : .but theres no- thing certain in this experiment. They ought to have put into the fcales^ two veffels of equal weight, whereof one ihould be fhut,and the other open:4* for thus air, not blown in, but barely inclosd, had been weighed ; when,
. The philosophical works of the Honourable Robert Boyle esq.: abridged, methodized, and disposed under the general heads of physics, statics, pneumatics, natural history, chymistry, and medicine. a pair of bellows, or with human** breath, is heavier than when flaccid, I will not deny, becaufe of the* greater quantity of atoms, or of fuliginous corpufclss : .but theres no- thing certain in this experiment. They ought to have put into the fcales^ two veffels of equal weight, whereof one ihould be fhut,and the other open:4* for thus air, not blown in, but barely inclosd, had been weighed ; when, therefore, air ihall be fo weighd, we will afterwards ronfider what may be faid to the phenomenon. The firft part of this paflage doesnot deny the gravity oi that we call air, but only endeavours to fhew,what parts they are that make it heavy. And, as to the fecond, he feemsto miftake the prefent cafe : for there is no need that the air in the bladder,before the exhauftion of the receiver, fhoud be heavier than the outwardair. Wherefore, when he fubjoins, that from this experiment we candeduce nothing certain, the affirmation is precarious. And Mr. Hobhs might Plate 3ax:. ^•iS3. fi^ 8f
Size: 868px × 2879px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, booksubjectchemistry, booksubjectmedicine, booksubjectphysics
