φ=0.8 (80%) ρн=17,3 г/м3 ρ=,
===
φ=ρ/ρн
ρ=φ*ρн=0,8*17,3=13,84 г/м3
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φ=0.8 (80%) ρн=17,3 г/м3 ρ=,
===
φ=ρ/ρн
ρ=φ*ρн=0,8*17,3=13,84 г/м3
======================