Define: (a) Sterilisation (b) Sedimentation (c) Loading (d) Aeration

(a) Sterilisation : It is a permanent method of contraception, for people who don't want more children, or any children. It works by stopping sperm from meeting an egg.

(b) Sedimentation : It is the tendency for particles in suspension to settle out of the fluid in which they are entrained and come to rest against a barrier.Settling is the falling of suspended particles through the liquid, whereas sedimentation is the termination of the settling process.

(c) Loading. It is a administration of a substance for the purpose of testing metabolic function.

(d) Aeration:  It is the process by which air is circulated through, mixed with or dissolved in a liquid or substance. Aeration is used in liquids, soils and foods to improve quality and reduce contamination. 

(a) Sterilisation : The process of removal of microorganisms including bacterial spores from water to avoid water borne diseases is known as sterilisation. 

(b) Sedimentation : The setting of suspended solid matter at the bottom of a liquid is called sedimentation. 

(c) Loading : The process of adding a chemical to an impure liquid in order to increase the speed of sedimentation of suspended particles is called loading. 

(d) Aeration : To kill harmful micro-organisms present in filtered water, air underpressure is blown into the filtered water. This process is called aeration.