Name the process by which oxygen from the air gets to the very bottom of the reservoir. Give a definition of this process.

Name the process by which oxygen from the air gets to the very bottom of the reservoir. Give a definition of this process. Is this process possible between substances in a solid state? Give an example to support your answer.

This process is called diffusion.
Diffusion – the mutual penetration of substances in contact with each other as a result of the thermal movement of molecules, leads to a uniform distribution
particles by volume.
An example in solids: at the interface between two different metals, a film is formed over time, which is an alloy.