%0 Journal Article %T DETERMINATION OF THE CELL WALLS DENSITY OF THE WOOD AND OTHER POROUS MATERIALS BY GAS PYCNOMETRY IN ATMOSPHERIC AIR %A Gaynullin, R.H. %A Safina, A.. %A Gaynullin, R.H. %A Cvetkova, E.M. %K wood, density of wood cell walls and porous materials, volume of a porous body, gas pycnometry, atmospheric air %J Forestry Engineering Journal %D 2021 %N 11 %P 11 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov