Relative density of a solid An accurate method for finding the relative density of a solid, based on Archimedes’ principle, is described in chapter 12.
Advantage of the density bottle We have already pointed out the advantage of the idea of relative density as a step towards the accurate measurement of density. There are no volume measurements to worry about. Weighings only are required and these can be carried out with a tappan or beam-balance to a fairly high degree of accuracy. Thus, […]
Calculation of density from relative density Suppose we have measured the relative density of a liquid as described above and found it to be 0.8. If we now assume that 1 cm ‘ of water has a mass of 1 g, it follows that the mass of any volume of water is numerically the same as its […]
To measure the relative density of a liquid The easiest way to ensure getting identically equal volumes of a liquid and water is to use a density bottle (Fig. 9.2). This bottle has a ground glass stopper with a fine hole through it, so that, when it is filled and the stopper inserted, the excess liquid rises through […]
Relative density In the last experiments described we had to make two measurements to find the density, namely, a mass and a volume. Now we can always measure mass more accurately than volume, and so, in the accurate determination of density, scientists have overcome the necessity to measure volume (hence eliminating one source of errQ[) by using the […]
Simple measurements of density Liquids. A convenient volume of the liquid is run off into a clean, dry, previously weighed beaker, using either a pipette or burette. The beaker and liquid are then weighed and the mass of the liquid found by subtraction. Solids. The volume of a substance of regular shape, e.g., a rectangular bar, cylinder, or sphere […]
Importance of density measurements Architects and engineers refer to tables giving the densities of various building materials when engaged in the design of bridges, ftyovers, and other structur From the plans drawn up, they can calculate the volume of any part of the structure which, multiplied by the density of the material, gives the mass and hence […]
Density and relative density One often hears the expressions, “as light as a feather” and “as heavy as lead”. Equal volumes of different substances vary considerably in mass. Aircraft are made chiefly from aluminium alloys, which provide a structure as strong as steel but which, volume for volume, weigh less than half as much. In physics we refer […]