Apositron is a particle similar to an electron, but with the opposite charge of an electron. if a positron and an electron collide, sometimes both the electron and positron disappear, and two photons are created. this is an example of

Annihilation of matter

Explanation:

Matter is annihilated when it collides with its antiparticle leading to a tremendous release of energy. This contradicts the law of conservation of matter which states that matter can neither be created nor destroyed.

what is the question?

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.