. The principles of physics. Fig. 147. 1 At 50° the limit would be - ( x ) = cm. At 100° the hight wouldbe — (76 x ) := 0 cm, the pressure of water vapor being equal to the pressureof the BUOYANCY OF FLUIDS. 175 Section VI. BUOYANCY OF FLUIDS. 146. Why a solid is buoyed up by a fluid, and with howgreat a force it is buoyed up. — Suppose dob a (Fig. 148) tobe a cubical block of marble immersed in a liquid. It isobvious that the downward pressure upon the surface da isequal to the weight of the column of liquidedao. The upward pressure on the surfacecJ
. The principles of physics. Fig. 147. 1 At 50° the limit would be - ( x ) = cm. At 100° the hight wouldbe — (76 x ) := 0 cm, the pressure of water vapor being equal to the pressureof the BUOYANCY OF FLUIDS. 175 Section VI. BUOYANCY OF FLUIDS. 146. Why a solid is buoyed up by a fluid, and with howgreat a force it is buoyed up. — Suppose dob a (Fig. 148) tobe a cubical block of marble immersed in a liquid. It isobvious that the downward pressure upon the surface da isequal to the weight of the column of liquidedao. The upward pressure on the surfacecJ is equal to the weight of a column ofliquid ecbo. The difference between theupward pressure against cb and the down-ward pressure on da, is the weight of acolumn of liquid ecbo less the weight of acolumn of liquid edao, which is a column ofliquid deb a (ecbo — edao^dcba). But ^^ j^g a column of liquid deb a has precisely thevolume of the solid submerged. Therefore, a solid is buoyedup by a fluid in consequence of the unequal pressures upon itstop and bottom at their different depths, and the amount of thebuoyancy is the weight of a volume of that fluid equal to thevolume of the im,mersed solid. This principle -^ may be
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysics, bookyear1895
