In which way does an elevation drawing differ from a floor plan?

The main way in which an elevation drawing differs from a floor plan is that the former shows the facade of a structure, so that the outside of the structure can be better visualizedwhereas floor-plans only show the "floor" area and dimensional elevations. 

0 = 0.40 / 0 = 0

= 0.20 = 9.80 ⁄2 =?

=0 , = = 0.20 =0.50 0 0.40 ⁄

=0−122 =0−12(9.80 ⁄2)(0.50)2 =1.2

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water