Porosity

Porosity or void fraction is a measure of the <a href="/facts/Void_(composites)/gkqmyd1s">void</a> (i.e. "empty") spaces in a <a href="/facts/Material/Rmt5HySL">material</a>, and is a <a href="/facts/Volume_fraction/nj2akBNM">fraction of the volume</a> of voids over the total volume, between 0 and 1, or as a <a href="/facts/Percentage/Wugt2XEf">percentage</a> between 0% and 100%. Strictly speaking, some tests measure the "accessible void", the total amount of void space accessible from the <a href="/facts/Interface_(matter)/HnIAndVA">surface</a> (cf. <a href="/facts/Closed-cell_foam/kGrXWWcb">closed-cell foam</a>).
There are many ways to test porosity in a substance or part, such as <a href="/facts/Industrial_CT_scanning/TnvAI9GL">industrial CT scanning</a>.
The term porosity is used in multiple fields including <a href="/facts/Pharmaceutics/ms5hhrMv">pharmaceutics</a>, <a href="/facts/Ceramic_engineering/WfrwB0F9">ceramics</a>, <a href="/facts/Metallurgy/1SANyxX4">metallurgy</a>, <a href="/facts/Materials_science/N5HrXRYW">materials</a>, <a href="/facts/Manufacturing/3qW7bcdy">manufacturing</a>, <a href="/facts/Petrophysics/nkPH85tL">petrophysics</a>, <a href="/facts/Hydrology/Xh727cnE">hydrology</a>, <a href="/facts/Earth_sciences/rQsXCSbM">earth sciences</a>, <a href="/facts/Soil_mechanics/WfVDFMAW">soil mechanics</a>, <a href="/facts/Rock_mechanics/mBcRh3MW">rock mechanics</a>, and <a href="/facts/Engineering/RFVg8H3I">engineering</a>.

Porosity open-in-new

Porosity