Chemical hoods used in our laboratories protect workers using volatile hazardous materials. Which of the following statements is true? A. A worker should feel a steady draft entering the face of the hood.
B. A worker should not feel air moving around the chemical hood.
C. A worker should feel a steady draft emerging from the face of the hood.

B. A worker should not feel air moving around the chemical hood.

Explanation:

Hello!

In this case, since chemical hoods are used to remove the hazardous vapors given off by volatile chemicals, the idea is that the workers do not get in contact, in anyway, with those vapors as they can affect their health and safety at the laboratories.

It means that options A and C are ruled out  because they describe an scenario in which the worker is in contact with the vapors and also because the vapors are removed via a fan system that withdraws the vapors.

Therefore the correct option is B. A worker should not feel air moving around the chemical hood.

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