Which of the following is an example of a safe laboratory procedure?

a. tying back long hair and loose clothing

b. eating or drinking from laboratory glassware

c. touching hot objects with your bare hands

d. testing an odor by directly inhaling the vapor

A is the correct answer. Tying back long hair and loose clothing is important so they don’t dangle in flames or liquids that could dissolve or bleach them, for example. The other choices - consuming food and drink from lab wares, touching hot objects without gloves on and inhaling odors - are examples of very unsafe procedures.