##  [Porosity](/porosity) 

  ##  [Porosity](https://earthenviro.quantumdictionary.io/porosity-1) 

  

 [![Earth & Environmental Sciences Dictionary](/sites/default/files/styles/large/public/2026-01/Earth%20%26%20Environmental%20Sciences.png.webp?itok=8-8yK_gA)](/topic-specific-dictionaries/natural-formal-sciences/earth-environmental-sciences)

- Natural & Formal Sciences -

**Earth & Environmental Sciences Dictionary**

 







 

 

 

 



 

 

 

 

Definition

An Earth and environmental sciences concept defining a process, measurement, or principle used to understand Earth and its systems. It applies within stated assumptions and depends on reliable observation and analysis. It does not ensure correct inference without attention to scale, uncertainty, and validation.



 

 

 

 

 





 

 



 ##  [Porosity](https://natural.quantumdictionary.io/porosity-0) 

  

 [![Natural & Formal Sciences Dictionary](/sites/default/files/styles/large/public/2026-01/Natural%20%26%20Formal%20Sciences.png.webp?itok=2kCDRVQv)](/topic-specific-dictionaries/natural-formal-sciences)



**Natural & Formal Sciences Dictionary**

 







 

 

 

 



 

 

 

 

Definition

The fraction of a porous material's total volume that is occupied by void (pore) space, typically expressed as a dimensionless ratio or percentage.

 

 

 

 

 





 

 



 ##  [Porosity](https://puremath.quantumdictionary.io/porosity-2) 

  

 [![Pure Mathematics Dictionary](/sites/default/files/styles/large/public/2026-01/Pure%20Mathematics.png.webp?itok=5pZnFQ59)](/topic-specific-dictionaries/mathematics-logic/pure-mathematics)

- Mathematics & Logic -

**Pure Mathematics Dictionary**

 







 

 

 

 



 

 

 

 

Definition

Porosity is a quantitative modulus for the relative size of holes in a set at small scales. Common formulations define the upper porosity of E at x as the limsup as r→0 of the supremum of α ∈ [0,1] such that there exists a ball of radius α r contained in B(x,r) \ E; global porosity may be the infimum of such local porosities or the existence of a uniform α>0 working for all x and small r.

 

 

 

 

 





 

 



 ##  [Porosity](https://engineering.quantumdictionary.io/porosity-3) 

  

 [![Engineering & Applied Technologies Dictionary](/sites/default/files/styles/large/public/2026-01/Engineering%20%26%20Applied%20Technologies.png.webp?itok=_IKO7_-n)](/topic-specific-dictionaries/engineering-applied-technologies)



**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

The fraction of a material's bulk volume that is occupied by voids or pores, expressed as a dimensionless ratio (0–1) or percentage; includes both connected and isolated pore space and excludes surface roughness not forming internal voids.

 

 

 

 

 





 

 



 ##  [Porosity](https://health.quantumdictionary.io/porosity-4) 

  

 [![Health & Life Sciences Dictionary](/sites/default/files/styles/large/public/2026-01/Health%20%26%20Life%20Sciences.png.webp?itok=yyyaiQOY)](/topic-specific-dictionaries/health-life-sciences)



**Health & Life Sciences Dictionary**

 







 

 

 

 



 

 

 

 

Definition

The fraction of an object’s total volume that is occupied by voids or pores, expressed as a ratio (0–1) or percentage. Porosity may refer to total porosity (open plus closed pores) or to open porosity (pores connected to the external surface); the appropriate definition depends on context and measurement method.