this question is unanswerable without more information.
Are you referring to a 4" steel stud?
If so, it depends how closely the studs in the stud wall are spaced, how tall the studs are and if they have lateral bracing (and if so, how much/at what heights?).
You also need to state what gauge the steel is.
If you are referring to channel steel to be used as a beam/purlin/rafter - one would need to know the span and the thickness of the steel.
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It depends on what the beam is made of.
a piece of yellow pine in an inside dry location can hold 1200 pounds per square inch and a 4" x 4" is really 3 1/2" X 3 1/2" or 12.25 square inches times 1200 is 16150 pounds
double a litre and you'll have your answer ?
depends what its made of
1 metre = 100 cm125 mm = 12.5 cmVolume of a cylinder = (pi) x (radius)2 x (length)Radius = 1/2 of diameter = 6.25 cmVolume = (pi) x (6.25)2 x (100) = 12,271.85 cm3 = 12.272 litres (rounded)