Chris is about to do an experiment to measure the density of water at several temperatures. His teacher has him prepare and sign a safety contract before beginning the experiment. Which item is most likely part of the safety contract?

A lab safety contract commonly includes checking equipment for damage before use. Cracked or chipped glassware can break and cause cuts, so Chris should inspect it before beginning the experiment. Bringing an MSDS on a personal laptop is not a typical safety requirement for measuring water density, and water does not require special handling instructions.

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