a. Absorption: The process in which the contaminant permeates or dissolves into a solid or a liquid is called absorption.
b. Adsorption: The process in which the contaminant accumulates on the surface of a solid or a liquid is called adsorption.
c. Confined space: A small area with limited access for entry and exit, and with enough space for a person to work is called confined space. It is not designed for continuous worker occupancy.
d. Contaminant: A physical, chemical, biological or radiological substance which causes impurity and pollution in the atmosphere and surroundings is called contaminant.
e. Hazardous atmosphere: The atmosphere which exposes the workers to risk of death or may cause severe illness or injury due to presence of contaminants is called Hazardous atmosphere. This atmosphere may be explosive, flammable, oxidizing, oxygen deficient, irritating or toxic etc.
f. HVAC: It is the acronym of Heating, Ventilation and Air conditioning. HVAC is the mechanical system used for controlling the environmental conditions such as humidity, temperature, movement and cleanliness of air.
g. Oxygen enriched: When the oxygen content in the atmosphere increases to more than 23.5% compared to 21% in ordinary air, it is called oxygen enriched. In this condition, atmosphere is more prone to fire hazards.
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