“Heat may be considered, either in respect of its quantity, or of its intensity. Thus two lbs. of water, equally heated, must contain double the quantity that one of them does, though the thermometer applied to them separately, or together, stands at precisely the same point, because it requires double the time to heat two lbs. as it does to heat one.” MayDoeTwoTogetherScienceBlackWaterHeatIntensityQuantityThermometers Author:Joseph Black
“What I have related is sufficient for establishing the main principle, namely, that the heat which disappears in the conversion of water into vapour, is not lost, but is retained in vapour, and indicated by its expansive form, although it does not affect the thermometer. This heat emerges again from this vapour when it becomes water, and recovers its former quality of affecting the thermometer; in short, it appears again as the cause of heat and expansion.” DoeFormLostCausesBlackWaterQualityPrinciplesDisappearConversionFormerHeatRelatedSufficientExpansionThermometersVapour Author:Joseph Black
“A nice adaptation of conditions will make almost any hypothesis agree with the phenomena. This will please the imagination but does not advance our knowledge.” DoeImaginationNiceConditionsPleaseAgreeHypothesisAdaptation Author:Joseph Black
