Definition

Noun: 1. The quality or state of being porous: The physical property of a material that contains many tiny, interconnected holes or spaces (pores) that allow liquids or gases to pass through it. 2. The ratio of the volume of pores (empty spaces) to the total volume of a material: A measurable quantity, often expressed as a percentage, that describes how much of a substance is open space.

Examples

• The porosity of this sponge is what makes it so good at absorbing water.
• Geologists study the rock's porosity to determine if it can hold oil or natural gas.
• High porosity in soil allows for better drainage and aeration for plant roots.
• The porosity of the concrete was too high, causing it to absorb moisture and crack in the winter.

Advanced Usage

• Effective Porosity: Refers to the interconnected pore space that actually allows fluids to flow through a material, as opposed to isolated pores.
  • The effective porosity of the aquifer determines how much water can be extracted.
• Primary/Secondary Porosity: In geology, primary porosity is the original pore space formed during rock formation (e.g., spaces between sediment grains), while secondary porosity develops later through processes like fracturing or dissolution.
  • The limestone's high porosity is mainly due to secondary dissolution.

Variants and Related Words

• Porous (adjective): Having many pores; able to absorb liquids or allow air to pass through.
  • Porous materials like clay are often used in filters.
• Pore (noun): A minute opening in a surface, especially of skin or rock, through which gases or liquids can pass.
  • Water seeps through the pores in the rock.
• Nonporous (adjective): Not porous; having no pores or not allowing liquid or air to pass through.
  • A nonporous countertop, like granite, resists stains.
• Permeability (noun): While related, this is a distinct property. It refers to how easily a fluid can flow a porous material, which depends on the size and connectivity of the pores, not just their volume (porosity).

Synonyms

• Permeability (in some general contexts, though technically different)
• Sponginess
• Absorbency

Antonyms

• Impermeability
• Solidness
• Nonporosity

Noun

1. the property of being porous; being able to absorb fluids