A square is a two-dimensional figure. The line segments that are its perimeter enclose a given area. This area might be considered the "inside" of the square, and might, in some sense, allow the square to be considered hollow.
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The volume of a square hollow bar is calculated by multiplying the length of the bar times the width of the opening times the height of the opening ( inner dimensions ).
About 12.
weight of ms hollow bar 20mm*20mm
I understand such blocks come in different sizes.
20