What term describes the absorption of fluids into the pore spaces of a rock?

What term describes the absorption of fluids into the pore spaces of a rock?

• A. Adsorption
• B. Imbibition
• C. Absorption
• D. Desorption

Answer: (B)

Imbibition is the process by which a liquid is drawn into the interconnected pore spaces of a porous solid, like a rock, driven by capillary forces and pressure differences. This specifically describes fluid entering the pore network rather than just sticking to surfaces or being taken up into the bulk. Adsorption refers to molecules adhering to surfaces, not filling the pore volumes. Absorption is a broader term for uptake into a material’s volume, which isn’t as precise for describing pore-space filling in rocks. Desorption is the release of previously adsorbed molecules from a surface. In the context of rocks and pore space, imbibition is the precise term for fluids invading the pore network.

Imbibition is the process by which a liquid is drawn into the interconnected pore spaces of a porous solid, like a rock, driven by capillary forces and pressure differences. This specifically describes fluid entering the pore network rather than just sticking to surfaces or being taken up into the bulk. Adsorption refers to molecules adhering to surfaces, not filling the pore volumes. Absorption is a broader term for uptake into a material’s volume, which isn’t as precise for describing pore-space filling in rocks. Desorption is the release of previously adsorbed molecules from a surface. In the context of rocks and pore space, imbibition is the precise term for fluids invading the pore network.