to calculate the volume of any bag we need to know the density. In freshly packed bags the standard density is 1440 kg/m3.
Example: to know the volume of a 50kg cement bag we divide the bag weight by the density, i.e.:
50 kg ÷ 1440 kg/m3 = 0.0347 m3
50kg = 0.0347 m3,
50kg = 1.23 CFT
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In the USA, a bag of cement usually weighs 94 pounds and has a volume of 1 cubic foot.
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for find the Volume of 1 bag cement,
the best way is preparing of measure box (35cmx25cmx40cm)=0.035m3
According to the SLS - 107 Conditions the volume of a cement bag (contains 50 kg ) should be 1.25 cubic feet.
Please search for more details SLS-107 Conditions