Final answer:
Particulates are small particles of various substances that are in the air, such as dust, dirt, viral particles, and bacteria. Neither Technician A nor Technician B is correct in their definitions.
Step-by-step explanation:
Particulates are small particles of various substances that are in the air, such as dust, dirt, viral particles, and bacteria. They are not specific to petroleum or carbon alone.
Technician A is incorrect in stating that particulates are small particles of petroleum. Technician B is also incorrect in stating that particulates are small particles of carbon. Both statements are inaccurate.
Therefore, neither Technician A nor Technician B is correct in their definitions of particulates.