Which is a porous material
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A porous medium or a porous material is a material containing pores (voids).Many natural substances such as rocks and soil (e.g. aquifers, petroleum reservoirs), zeolites, biological tissues (e.g. bones, wood, cork), and man made materials such as cements and ceramics can be considered as porous media.
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Materials which allow air to flow through them are called porous material. Examples: few types of soil, foam, sponge, etc.
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