The void spaces found in rock, sediment, or soil. Commonly measured as the percentage of void space in a volume of substance.

The percentage of pore volume or void space, or that volume within rock that can contain fluids. Porosity can be a relic of deposition (primary porosity, such as space between grains that were not com [..]

The density of a substance and its capacity to pass liquids, such as membranes, housewrap, vapor retarders, etc.

In hydrologic terms, (1) The ratio of pore volume to total volume of the formation. Sandy soils have large pores and a higher porosity than clays and other fine-grained soils. (2) An index of the void [..]

late 14c., from Old French porosité, from Medieval Latin porositas, from porus (see pore (n.)).

the ratio of the volume of all the pores, or holes, in an object and the object's total mass.

Soil porosity refers to that part of a soil volume that is not occupied by soil particles or organic matter. Pore spaces are filled with either air, other gases, or water. Large pores (macropores) allow the ready movement of air and the drainage of water.

the amount of space within rocks or soils.

The ratio of pore volume to total volume of a filter medium expressed as a percent.

The ratio of the total volume of pore space (voids) in a rock or soil to its total volume, usually stated as a percentage. Effective porosity is the ratio of the volume of interconnected voids to the total volume. Unconnected voids contribute to total porosity but are ineffective in transmitting water through the rock.

the degree to which a rock or soil is porous.

Multiple voids in an insulation cross-section.

A matter which is porous or contains pores which are able to absorb liquid. Subfloors, which are porous, are normally concrete and wood. If there is any doubt as to the porosity of a subfloor, put a few drops of water on the surface. If the water is quickly absorbed, the surface is porous. If the water remains on the surface, the surface is nonporo [..]

A ratio between the volume of the pore space in reservoir rock and the total bulk volume of the rock. The pore space determines the amount of space available for storage of fluids.

The density of substance and its capacity to pass liquids.

Ratio of pore space to the total volume of material expressed as a percent..

a measure of the water-bearing capacity of subsurface rock. With respect to water movement, it is not just the total magnitude of porosity that is important, but the size of the voids and the extent to which they are interconnected, as the pores in a formation may be open, or interconnected, or closed and isolated. For example, clay may have a very [..]

The volume of pores in a soil sample divided by the bulk volume of the sample. Air-filled porosity is the fraction of the bulk volume of soil that is filled with air at any given time or under a given condition, such as a specified soil-water content.

hydraulic engineering - the ratio of open area to total area of a screen or other porous barrier structure

The proportion of a rock volume (expressed as a percentage) that is occupied by the voids between mineral grains. Used to help estimate the volume of hydrocarbons in a field. Compare this with P

, Gas Cap

 – Degree of integrity or continuity.

The percentage of void in a porous rock compared to the solid formation.

Voids inside the casting: shrinkage porosity and blow holes.

percentage of the total volume of a rock or sediment that consists of open spaces. porphyry

The ratio of the volume of all the pores in a material to the volume of the whole.

the state of having open pore spaces in rocks

Undesired voids included in a part. Porosity can manifest in many sizes and shapes from many causes. Generally, a porous part will be less strong than a fully dense part.

(n) the property of being porous; being able to absorb fluids

a measure of the ratio of open space within a rock or soil to its total volume

The percentage of open spaces (pores) in rock or soil. When these spaces are interconnected, water, air, or other fluids can migrate from space to space. Interconnected spaces make the soil or bedrock [..]

The degree to which the soil mass is permeated with pores or cavities. The porosity is the sum of the capillary and non-capillary porosity values.

The percentage of pores in a soil or HTMLContent zone mixture that retain water after free drainage. This also is occasionally referred to as water-filled porosity.

capillary - The large pores in a soil or HTMLContent zone mixture that are filled with air after free drainage. Also referred to as air-filled porosity.

The presence of pores or voids in a coating whether connected or not. Porosity is not the same as pull-out.

The ratio of the aggregate volume of pore spaces in rock or soil to its total volume; usually stated as a percentage.

Gas pockets or voids in metal.

The percentage of open spaces (pores) in rock or soil. When these spaces are interconnected, water, air, or other fluids can migrate from space to space. Interconnected spaces make the soil or bedrock permeable.

A hole-like discontinuity formed by gas entrapment during solidification.

Percentage of pore volume or void space within rock. In subsurface rock, this void space can contain fluids, usually water and sometimes oil or gas. Porosity varies significantly depending on rock typ [..]

the ability of adherend to absorb and adhere.

The amount and size of the pores in a stone. Travertine is very porous and granite is not.

Having numerous holes or pores.

The total volume of the base divided by the volume of voids in the base.

Degree to which soil, gravel, sediment or rock is permeated with pores or cavities through which water or air can move.

Degree to which soil, gravel, sediment, or rock is permeated with pores or cavities through which water or air can move.

Degree to which soil, gravel, sediment, or rock is permeated with pores or cavities through which water or air can move.

The ratio between openings (voids, pores) in rocks or soil to the total volume. It is a measure of the ability of soil/rock material to store water. The more openings, the more water that may be store [..]

Condition of having pores or open spaces. This often refers to bones, bone implants, or Bone Cements, but can refer to the porous state of any solid substance.

Condition of having pores or open spaces. This often refers to bones, bone implants, or bone cements, but can refer to the porous state of any solid substance.

Of sufficiently loose texture to permit passage of liquid or gases through pores.

The percentage of the soil volume not occupied by soil solids.

A measure of the spaces or voids in a material or aquifer. The ratio of the volume of spaces in a rock or soil to the total volume. This ratio is usually expressed as a percentage.

Permeability by water.

Porosity refers to the amount of space between the solid soil particles. Pore space can be filled with either water or air.

When a growing media has approximately equal amounts of water-filled and air-filled pore space, the soil is said to have balanced porosity.

The percentage of pores in a soil or root zone mixture that retain water after free drainage. This also is occasionally referred to as water-filled porosity.

The large pores in a soil or root zone mixture that are filled with air after free drainage. Also referred to as air-filled porosity.

The degree to which the soil mass is permeated with pores or cavities. The porosity is the sum of the capillary and non-capillary porosity values.

A measure of the water-bearing capacity of subsurface rock. With respect to water movement, it is not just the total magnitude of porosity that is important, but the size of the voids and the extent t [..]

The percentage of the total volume of rock or soil that consists of open spaces. (The space between particles is called pore space.)

The ratio of the volume of all the pores in a material to the volume of the whole.

The ratio of pore volume to total volume of the formation. Sandy soils have large pores and a higher porosity than clays and other fine-grained soils. An index of the void characteristics of a soil or stream as pertaining to percolation; degree of previousness.

The percent of open areas per unit volume of fabric.

In hydrologic terms, (1) The ratio of pore volume to total volume of the formation. Sandy soils have large pores and a higher porosity than clays and other fine-grained soils. (2) An index of the void characteristics of a soil or stream as pertaining to percolation; degree of previousness.

Porosity is the volume of voids in a material expressed as a percentage of the total volume of the material.

Ability to absorb moisture.

Degree to which soil, gravel, sediment, or rock is permeated with pores or cavities through which water or air can move.

The volume of space in a rock or soil between soil or mineral particles.

the property of being porous, having pores; the ratio of minute channels or open spaces (pores) to the volume of solid matter.

The measure of a rock’s ability to slow a fluid.  Porosity is normally expressed as a percentage of the total rock which is taken up by pore space.

The percentage of void in a porous rock compared to the solid formation.   

The open space within a rock, similar to a sponge.

The proportion of a rock's total volume occupied by voids between the mineral grains. These voids are filled by oil, gas or water.

a measure of the relative volume of void space in rock to the total rock volume. These spaces or pores are where oil and gas accumulate; therefore, a formation containing a high percentage of porosity [..]

the volume of spaces within rock that might contain oil and gas (like the amount of water a sponge can hold); the open or void space within rock

  A measure of the relative volume of void space in rock to the total rock volume. These spaces or pores are where oil and gas accumulate; therefore, a formation containing a high percentage of porosi [..]

Percentage of the rock volume that can be occupied by oil, gas or water.

a measure of the amount of free space, or voids, in a rock; generally expressed as a percentage of the total volume.

The volume of the pore space expressed as a percent of the total volume of the rock mass.

The open space within a rock, similar to pores in a sponge.

The capacity of a reservoir to store fluids, the volume of the pore space within a reservoir.

A ratio between the volume of the pore space in reservoir rock and the total bulk volume of the rock. The pore space determines the amount of capacity available for storage of fluids. Primary recovery

A measure of the number and size of the spaces between each particle in a rock. Porosity affects the amount of liquid and gases, such as natural gas and crude oil, that a given reservoir can contain.

Proportion of pore space to the total volume of soil or rock

The volume of the pore space expressed as a percent of the total volume of the rock mass.

A ratio between the volume of the pore space in reservoir rock and the total bulk volume of the rock. The pore space determines the amount of space available for storage of fluids.

Porosity measures the open space ("pore space") between grains. The lower the porosity, the more important hydraulic fracturing is to extracting natural gas.

The capacity of a reservoir to store fluids, the volume of the pore space within a reservoir. Thus porosity measures the capacity of the rock to hold natural gas, crude oil or water.

A measure of the number and size of the spaces between each particle in a rock. Porosity affects the amount of liquid and gases, such as natural gas and crude oil, that a given reservoir can contain.

The ratio of the holes, voids, or pores in a rock to its total volume or size. Also, a measure of the capability to contain fluid within void spaces in a rock.

The percentage (by volume) of holes or voids in a rock. Commercially productive reservoir rocks typically have porosities ranging from about 5% to 35%. The higher the porosity, the more oil or gas that can be contained in the pore spaces, the better the quality of the reservoir rock.

Measure of relative volume of void space in rock to the total rock volume. These spaces or pores are where oil and gas accumulate; therefore, a formation containing a high percentage of porosity can c [..]

the ratio of pore volume to total volume of a filter medium expressed as a percent.

condition of being porous such as in a rock formation; ratio of volume of empty space compared to volume of solid rock in formation which indicate how much a rock can hold. Pump Jack

Percentage of void space versus solid rock, which is the space where oil is potentially trapped.

The ratio of the volume of pore space in rock to its total volume, expressed as a percentage. 

The percentage that the volume of the pore space bears to the total bulk volume. the pore space determines the amount of space available for storage of fluids.

The proportion of a material (such as shale

A measurement of the number and size of the spaces between each particle in a rock. Porosity affects the amount of liquid and gases, such as natural gas and crude oil, that a given reservoir can contain.

A ratio between the volume of the pore space in reservoir rock and the total bulk volume of the rock. The pore space determines the amount of space available for storage of fluids.

Closely related to permability, this is a measure of the amount of "voids," or empty space in a rock where gas or oil can pass through to collect in a reservoir.

Measure for the amount of pore space in a rock

The pencentage of pore space in a rock. Porosity in sedimentary rocks ranges from less than 1 percent to more than 50 percent and depends on the sorting, angularity and packing ofthe grains, as well a [..]

percentage of the rock and soil that is void of material[10]

Ability to absorb moisture.

In hydrologic terms, (1) The ratio of pore volume to total volume of the formation. Sandy soils have large pores and a higher porosity than clays and other fine-grained soils. (2) An index of the void [..]

The amount of air that will pass through a given area of material (see ZP)

The ratio of the volume of pore spaces in a rock or sediment to the total volume of the rock or sediment.

The pore spaces which were created at the time of deposition of a soil or rock unit.

The pore spaces which were created after the time of deposition of a soil or rock unit (e.g. fractures, solution channels).