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| style="height:20px; width:200px; text-align:center;" |'''A 200,000cm<sup>3</sup> [[volume]] of [[air]] has a [[mass]] of 245[[g]]. Calculate the density of [[air]].
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| style="height:20px; width:200px; text-align:centerleft;" |
[[Mass]] = 5000[[kg]]
:<math>\rho = \tfrac{5000}{0.635}</math>
:<math>\rho = 7874kg/m<sup>^3</sup></math>| style="height:20px; width:200px; text-align:centerleft;" |
[[Mass]] = 50[[kg]]
:<math>\rho = \tfrac{50}{0.05}</math>
:<math>\rho = 1000kg/mkg/m<sup>^3</sup></math>| style="height:20px; width:200px; text-align:centerleft;" |
[[Mass]] = 245[[g]] = 0.245[[kg]]
:<math>\rho = \tfrac{0.245}{0.2}</math>
:<math>\rho = 1.225kg/m<sup>^3</sup></math>
|}