Sand density

Sand density

Have you done any physical research recently? Let me give you an answer to the packing density of building materials: the packing density of sand is generally 1300 – 1600kg / m3 (related to water content) and the packing density of stone is generally 1500 – 1800kg / m3 (related to stone material). The packing density of sand is usually 1.28t/m3 and the packing density of stone is usually 1.48t/m3

What is the meaning of cubic kilogram per cubic meter with iron density of 7.9 × 10
What's that for

The mass of iron per cubic meter is 7.9 × 10 cubic kilogram

The mass of the model is 1800 g, the density of wax is 900 kg / m3, so how many kg is it necessary to cast such iron parts
The density of iron is 7.8

Volume v = m wax / ρ wax = 1.8kg/900kg/m & # 179; = 2 × 10 ^ (- 3) M & # 179;
The mass of iron M = ρ, iron × v = 7.8 × 10 & # 179; × 2 × 10 ^ (- 3) = 15.6kg