He654~3;::..2-:~HP~H2<~-;;::;:N20"•••........::::-.-----....-300r-:;~~=IOO 0 100 200 300-273°CTeC)Figure 5.8Plots ofVversusT(0G)for severalgases. The solid lines represent experi-mental measurements of gases. Thedashed lines represent extrapolation .ofthe data into regions where these gaseswould become liquids or solids. Notethat the samples of the various gasescontain different numbers of moles.Charles's law:VIXT(expressed in K)ofconstant pressure.EXAMPLE5.4Charles's law also can be written as!i=V2t,T25.2The Gas Laws of Boyle, Charles, and Avogadro187HeCH4654~3;::..2Figure 5.9Plots ofVversusTas in Fig. 5.8, except here theKelvin scale is used for temperature.173 273 373 473 573T(K)because the samples contain different numbers of moles of gas. A very interesting featureof these plots is that the volumes of all the gases extrapolate to zero at the same temper-ature, -273°C. On the Kelvin temperature scale this point is defined as 0 K, which leadsto the following relationship between the Kelvin and Celsius scales:K=°C+273When the volumes of the gases shown in Fig. 5.8 are plotted versus temperature on the
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