Final answer:
When an air bubble appears while gluing a tip on, it should be addressed by gently poking the bubble with a needle or toothpick to release the trapped air, ensuring complete contact between the adhesive and surfaces.
Step-by-step explanation:
When gluing a tip on and an air bubble appears, it is important to address it immediately to ensure a secure adhesion. If the question pertains to a school experiment involving bubbles formed at the tips of pencils during electrolysis, as indicated by the mention of oxygen and hydrogen gas formation, the presence of an air bubble could impact the observations or results. In such a case, gently poking the bubble with a needle or thin object like a toothpick can release the trapped air, allowing the adhesive to make complete contact with the surfaces. For experiments where an air bubble forms under a plastic loop or when manipulating items with static electricity, as with the plastic loop hovering above a charged balloon, you would want to adjust the position of the objects to remove the air bubble. In situations where adhesives are used and bubbles form, they should be smoothed out carefully to prevent future peeling or detachment.