Place the specially prepared egg in the mouth of the 500-mL Erlenmeyer flask and show that the egg will not pass through the flask's mouth. Remove the egg. Grab a cotton ball with the tongs, saturate it with ethanol, light it, and place it in the flask. Immediately replace the egg on the flask's mouth. When the flame extinguishes, the egg is sucked into the flask and bursts.
Hard egg Put on the gloves and goggles.
Remove the egg. Grab a cotton ball with the tongs, saturate it with ethanol, light it, and place it in the flask. Immediately replace the egg on the flask's mouth. When the flame extinguishes, the vacuum rips the egg apart. Part of the egg is sucked into the flask while the rest remains on the flask's mouth.