Answer : Option D) Density.
Explanation : A kilogram of lead has greater density than a kilogram of air.
Density of lead is greater than air because lead has density [tex] 11.34 \frac{g}{cm^{3}} [/tex], whereas air has density of [tex] 0.001225 \frac{g}{cm^{3}} [/tex].
It is clear from the above values, that one kilogram of lead will be obviously denser than kilogram of air.
