Dosing generally applies to feeding chemicals or medicines in small quantities into a process fluid or to a living being at intervals or to atmosphere at intervals to give sufficient time for the chemical or medicine to react or show the results. This word dosing as per the dictionary is the verb format for the word dose which is a noun.
In the case of human beings or animals (i.e. living beings) the word dose is generally used but in the case of inanimate objects the word dosing is being used. This is only in practice.
The word dosing is very commonly used by engineers in Thermal power stations or in any industry where steam is being generated. Dosing procedures are also in vogue in textile and similar industries where chemical treatment is invloved. In a power station treatment chemicals are injected or fed to boiler and also to feed and make up water under pressure, but in small dosages or rate of injection. The feeding at all places is done by means of small capacity dosing pumps specially designed for the duty demanded.
The feeding of chemicals in agriculture has also become common due to technology developments in this field. However the dosing in the agricultural field is done by means of hand held pressure spray pumps or similar devices.
Some times aerial spraying of chemicals by fixed quantities at intervals or dosing is also adopted for agricultural spraying or for atmospheric spraying for eliminating certain types of harmful insects.