Definitions
- Describing the ability of a material to allow the passage of gases or liquids through it. - Referring to the measure of the rate of gas or liquid flow through a material under specific conditions. - Talking about the extent to which a material can be penetrated by gases or liquids.
- Describing the ability of a material to allow the passage of gases or liquids through it. - Referring to the measure of the rate of gas or liquid flow through a material under specific conditions. - Talking about the extent to which a material can be penetrated by gases or liquids.
List of Similarities
- 1Both words describe the ability of a material to allow the passage of gases or liquids through it.
- 2Both words are used in scientific and technical contexts.
- 3Both words are related to the concept of porosity.
- 4Both words are measured using similar units, such as perm or darcy.
What is the difference?
- 1Usage: Permeance is more commonly used in the United States, while permeability is more commonly used in Europe.
- 2Definition: Permeance refers to the rate of gas or liquid flow through a material, while permeability refers to the ease with which gases or liquids can pass through a material.
- 3Units: Permeance is measured in perms or ng/(Pa.s.m²), while permeability is measured in darcys or m².
- 4Calculation: Permeance is calculated by dividing the thickness of the material by the rate of gas or liquid flow, while permeability is calculated by dividing the volume of fluid that passes through the material by the time and pressure difference across the material.
- 5Application: Permeance is often used in building science to measure the water vapor transmission rate of building materials, while permeability is often used in geology to measure the ability of rocks or soils to transmit fluids.
Remember this!
Permeance and permeability are synonyms that describe the ability of a material to allow the passage of gases or liquids through it. However, there are some differences between the two terms. Permeance measures the rate of gas or liquid flow through a material, while permeability measures the ease with which gases or liquids can pass through a material. Additionally, permeance is more commonly used in the United States, while permeability is more commonly used in Europe.
