What is the boiling point of water in the Fahrenheit scale (in $^\circ F$)?

What is the density of water in $kg \ dm^{-3}$ if its density in $g \ cm^{-3}$ is $0.863$?

If the volume of $15.9 \ g$ of carbon tetrachloride is $10 \ mL$,calculate its density.

What is the $SI$ unit of density?

The diameter of a zinc atom is $2.6 \, \mathring{A}$. Calculate $(a)$ the radius of the zinc atom in $pm$ and $(b)$ the number of atoms present in a length of $1.6 \, cm$ if the zinc atoms are arranged side by side lengthwise.

Define significant figures.