19. Fluid Mechanics

There is a maximum height of a uniform vertical column made of any material that can support itself without buckling, and it is independent of the cross-sectional area (why?). Calculate this height for ordinary steel (density 7.8 x 10³ kg/m³).

(II) How much pressure is needed to compress the volume of an iron block by 0.10%? Express your answer in N/m², and compare it to atmospheric pressure (1.0 x 10⁵ N/m²).