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Apparent Porosity refers to the amount of void (or pores) within a volume of sediment or porous solid. The value of porosity is measured as a fraction or percentage. The True Porosity includes the volume of the sealed pores also.
Formula :
Apparent porosity = ( s - w )/( s - i) * 100
where,
s - weight of piece soaked
w - weight of dry piece
i - weight of the piece soaked and immersed.
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