The process that occurs when a physical pressure pushes materials through a barrier is called filtration.

Here's why:

* Filtration is the process of separating solid particles from a fluid (like a liquid or gas) by passing the mixture through a porous material. The pressure difference drives the fluid through the barrier, leaving the larger particles behind.

Here are some examples of filtration:

* Coffee maker: Coffee grounds are filtered from water by passing the mixture through a filter.

* Kidney: The kidneys filter waste products from blood, leaving clean blood behind.

* Air filter: An air filter removes dust and other particles from air by passing it through a porous material.

Let me know if you have any other questions!