Main Answer
If it is not safe for you to determine a certain physical property of a substance, such as the boiling point of your plastic Lego, you should consult a reliable source or seek the assistance of a qualified professional.The answer is: consult a reliable source or seek the assistance of a qualified professional.
Step-by-step explanation
When dealing with physical properties of substances, safety should always be a top priority. If you are unsure about the boiling point of a substance, such as your plastic Lego, it may be due to the fact that not all plastics have well-defined boiling points.
In fact, some plastics decompose or melt before they reach their boiling points. Therefore, it's important to consult a reliable source or seek the assistance of a qualified professional to determine the physical properties of a substance, especially if there are safety concerns involved.