What object have a mass that is greater then 300 grams

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 term is mostlikely part of the safety contract

This is the si unit for force meter liter newton m/s/s

Помогите решить 5 номер в структурном виде пожалуйста буква д пожалуйста подробно мне понять надо