6. Calculate the densities of the liquids in Table 2.3. The accepted density of water is 1 g/ cm3. How do your results compare? Remember that 1 cm3 = 1 mL. 7. How does the density of water compare with the density of the saturated salt solution? Is this what you would have predicted?
8. Length of room m
9. Width of room m
4.02
3.37
10. Height of room m
11. Volume of room m3
12. Mass of air in room kg
13. Are you surprised by the mass of air in the room? Explain.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.