To separate them by any reasonable physical and/or chemical processes.

The exact physical or chemical process in the fiber are not well known.

Water is useful as a radiation shield and in many chemical processes.

Calorimetry - The study of heat changes in physical and chemical processes.

Here were chemical processes which normally could not have been demonstrated in a laboratory.

The net and local charge of the oceans remains neutral during any chemical process.

It had not been submitted to any chemical process.

This was believed to be due to chemical processes triggered by bacteria.

This results from a combination of physical and chemical processes.

For example, we can change chemical process fast and easily.