With there being 1000 mm3 to one cm3 the density is 0 00271g mm3 for aluminum which equates to 0 00000271kg mm3. If you want to calculate various steel weight correctly you must know the steel density first such as steel density iron density aluminum density brass density etc then to calculate the weight of ms plate gi sheet mild steel stainless steel ms angle ms pipe etc in kg m3 according to the weight calculation formula. The density of the aluminium will be different depending on the alloying elements. 
				
			
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