Surface Tension vs Interfacial Tension. Both surface tension and interfacial tension are effects based on liquids. Both these effects take place due to the unbalanced intermolecular forces between the liquid or solutions molecules.
Statistical process control (SPC) is a method of quality control which employs statistical methods to monitor and control a process. This helps ensure the process operates efficiently, producing more specification-conforming product with less waste (rework or scrap).
The IIA definition of control processes is: The policies, procedures (both manual and automated) and activities that are part of a control framework, designed and operated to ensure that risks are contained within the level that an organisation is willing to accept.