The density of a rock is 2.75g/cm3 and the porosity is 1.5%. Now the rock is broken into gravel. The bulk density of gravel is 1560kg / m3. The apparent density and porosity of the rock are determined

The density of a rock is 2.75g/cm3 and the porosity is 1.5%. Now the rock is broken into gravel. The bulk density of gravel is 1560kg / m3. The apparent density and porosity of the rock are determined

For the density of stone, there are real density, gross bulk density, apparent dry density, apparent density, etc

1. The water content of alcohol (ρ alcohol = 0.38g/cm3) produced by the factory is not more than 10%, and the maximum density is?

According to the meaning of the title: m water = 10% mm wine = 90% MV water = m water / ρ water = 10% m / ρ water = 1 / 10 * m / ρ water V wine = m wine / ρ wine = 90% m / ρ wine = 9 / 10 * m / ρ wine v = V water + V wine = 1 / 10 * m / ρ water + 9 / 10 * m / ρ wine ρ = m / V / (V water + V wine) = m / (1 / 10 * m / ρ water + 9 / 10 * m / ρ wine) = 1 / [(1 / 10) * (1 /

The water content of alcohol (density is 0.8g/cm3) produced by the factory shall not exceed 10%. The quality inspector shall take out four bottles of samples
The water content of alcohol (density is 0.8g/cm3) produced by the factory shall not exceed 10%. The quality inspector takes out four bottles of samples of methyl, ethyl and butyl alcohol, and the density is 0.81g/cm3.0.815.0.820.83 in turn, among which the qualified ones are 0.81g/cm3.0.815.0.820.83
I want to know why

0.8-0.8*10/=0.82