Difference Between Porosity and Void ??

1. The meaning is different.

Pore: refers to the space between solid mineral particles in rock and soil.

Void: refers to the empty space in the middle, and also refers to the time that has not yet been occupied, the time interval between similar situations or state reappearances, etc.

2. The formation process is different.

Porosity: is a loose rock layer composed of particles of different sizes, which are the voids between the particles and the aggregate of particles.

Voids: These are tiny cavities inside a material, or gaps in dense leaves.

Pores are individual, and voids are whole. Porosity is further divided into open and closed pores, and voids are the voids left by the accumulation of loose materials.

Porosity mostly refers to small round pores, and the number of pores is many, dense, and uniform, such as the pores of various soils. The shape of the void is different, which means that the things are not tightly packed and there are irregular small spaces, such as a large gap in the box, which can be packed with a few more clothes after compaction.

Relationship:Void ratioDefinitely larger than the void ratio,PorosityLess than 1.

If the porosity ratio e is known, the porosity can be calculated.

Formula: a=e (1+e).

Note: A represents porosity.

vv represents the volume of pores in the soil.

The porosity ratio and porosity are both physical state indicators of soil, which can be converted by three-phase sketches. It is only necessary to measure the natural density and water content by test.

and weight, and all other indicators can be calculated. Although each indicator can be found from each other, only three basic ones are not enough, and the introduction of other state quantities is mainly for the study of different problems or for different research objects.

Porosity ratio: The porosity ratio is the ratio of the pore volume in the soil to the volume of solid particles, which is an index to explain the structural characteristics of the soil. In engineering geology, the porosity ratio is usually used to evaluate the density of soil, calculate the compressibility coefficient of soil and evaluate the allowable bearing capacity of soil.

The porosity ratio e is an important physical property of soil.

Index, e can be used to evaluate the degree of compactness of the natural soil layer, generally speaking, the smaller the e value, the more compact the soil, the lower the compressibility; The higher the e value, the looser the soil and the higher the compressibility. The high compressibility of the soil indicates that the structural strength of the soil is poor, and the compression of the soil is large.

The above content refers to: Encyclopedia - porosity ratio.

Porosity is the ratio of pore volume to total volume, and porosity is the proportion of porosity between particles to total volume in the bulk volume of bulk granular material. Porosity includes true porosity, closed porosity, and pre-porosity. Porosity (p) refers to the percentage of a material's internal pore volume to its total volume.

Expression p=[(v0-v) v0 ]=1-v v0 ] 1-p0 p) 100 % Relationship between porosity and compactness d + p= 1 The porosity or compactness of the material directly reflects the degree of compactness of the material. The high porosity of the material indicates that the degree of density is small. Calculated formula p0'= m/ v0 'm (v+ vp + vv ) where p0'--Bulk density of the material, kg m3.

VP – the volume of pores inside the particle, m3. vv – volume of interparticle voids, m3. The ratio of the sum of the volume of all pore spaces in a rock sample to the volume of that rock sample is called the total porosity of the rock and is expressed as a percentage.

The larger the total porosity of the reservoir, the larger the pore space in the rock. From a practical point of view, only those pores that are connected to each other are of practical significance, because they not only store oil and gas, but also allow oil and gas to seep into them. Therefore, in production practice, the concept of effective porosity is proposed.

Effective porosity is the ratio of the sum of the pore volumes in which the fluid can be allowed to flow under normal pressure conditions, expressed as a percentage, of those that are interconnected with each other. Obviously, the effective porosity of the same rock is less than its total porosity. Definition of porosity in porous media:

Porosity refers to the ratio of the total volume of tiny voids in a porous medium to the total volume of the porous medium, and its expression is: v p v b) 100% porosity can be divided into two types: the ratio of the total volume of the interconnected tiny voids in the porous medium to the surface volume of the porous medium is called effective porosity, which is expressed by e; The ratio of the total volume of all the tiny voids that are connected and dissimilar within a porous medium to the surface volume of that porous medium is called absolute porosity or total porosity, and is denoted by t.

The so-called porosity usually refers to the effective porosity, but it is easy to write and is generally directly expressed in . Porosity is related to the shape, structure, and arrangement of solid particles in a porous medium. Among the common non-biological porous media, the porosity of saddle filler and glass fiber reached 83% and 93% at the maximum. The porosity of coal, concrete, limestone and dolomite can be as low as 2% 4%, the porosity of underground sandstone is mostly 12% 34%, the porosity of soil is 43% 54%, the porosity of brick is 12% 34%, and the porosity of leather is 56% 59%, all of which are medium values; The porosity of the vascular system of the kidneys, lungs, livers and other organs of animals is also moderate.

Porosity is an important parameter that affects the performance of fluid transport in porous media.

Void ratio e: The ratio of the volume of pores in the soil to the volume of solid particles in the soil.

PorosityThe ratio of the volume of pores in the soil to the total volume of the soil.

Relationship: 1 The porosity ratio is definitely greater than the porosity, and the porosity is definitely less than 12 If the porosity ratio e is known, the porosity can be calculated.

Formula: a=e (1+e).

Note: A represents porosity.

vv represents the volume of pores in the soil.

Porosity: Refers to the pores between aggregates.

Open pores: Refers to the small pores that connect the aggregate with the outside world.

Closed pores: refers to the small pores that the aggregate is not connected with the outside world.

Both open pores and closed pores affect the apparent density of aggregates, and open pores affect the water absorption of aggregates.

Porosity refers to the proportion of the volume of voids between particles to the total volume of bulk granular materials.

Porosity includes true porosity, closed porosity, and pre-porosity.

Porosity (p) refers to the percentage of the total volume of the pore volume inside the material. Expression p=[(v0-v) v0 ]=1-v v0 ] 1-p0 p) 100 %

The relationship between porosity and compactness d + p= 1 The porosity of the material is closed or the size of the compactness directly reflects the density of the material.

The high porosity of the material indicates that the degree of density is small. Calculated formula p0'= m/ v0 'm (v+ vp + vv ) where p0'--The bulk density of the material rises and cracks, kg m3. VP – the volume of pores inside the particle, m3.

vv – volume of interparticle voids, m3.

PorosityIncluding true porosity, closed porosity, and pre-porosity. Porosity (p) refers to the percentage of a material's internal pore volume to its total volume.

Expression. p=[(v0-v) v0 ]=[1-v v0 ] =(1-p0 p) 100 % The relationship between porosity and compactness d + p= 1 The porosity or compactness of the material directly reflects the density of the material. The high porosity of the material indicates that the degree of density is small.