Define the following, unit process, unit procedure, backwashing,boifir oil, pathogens?

- Unit process: A unit process is a specific step or operation within a larger process that is used to achieve a particular outcome or result. It is a discrete, identifiable part of a larger process.

- Unit procedure: A unit procedure is a specific set of instructions or steps that must be followed in order to carry out a particular unit process. It outlines the actions that need to be taken in order to achieve the desired outcome.

- Backwashing: Backwashing is a process used in water treatment and filtration systems where the flow of water is reversed in order to clean and remove debris or contaminants from the filter media. This helps to maintain the efficiency and effectiveness of the filtration system.

- Boifir oil: It seems there may be a typo in this term. It is possible that you meant to write "boiler oil," which refers to a type of fuel oil that is used in boilers for heating or power generation.

- Pathogens: Pathogens are microorganisms such as bacteria, viruses, or parasites that can cause disease in humans, animals, or plants. They are often found in contaminated water, food, or surfaces and can be transmitted through various means such as ingestion, inhalation, or contact with infected individuals.