기능

• Cover the mouth of a round bottom flask (500 mL) with a plug and soak it in hot water, and the plug will come out vigorously.
• It is possible to observe the phenomenon that the air in the flask warms and expands, and forces are applied to push out the plug.
• For round bottom flask 500 mL.
• Apply a small amount of soapy water around the mouth of the round bottom flask to perform the experiment more effectively.