Please answer a question about atmospheric pressure and buoyancy.

You are wrong. There is a power outage soon. I will talk to you tomorrow. .

Here I am, telling you the standard answer now. Someone has answered below, but they are all incorrect. After the lid is closed, the temperature of the air in the cup increases due to 1, so the heat expands and contracts 2, and the water vapor increases. Causes air pressure to increase! So who is this pressure pressing on? Tea of ??course! The volume of the tea will not change (because it is a liquid), so the two small bubbles will suffer in the end, as they are compressed. So what will this change lead to? Let me ask you, what determines buoyancy? One of the key factors is volume, and the smaller bubbles change this! Therefore, the buoyancy force decreases, but the gravity effect on the tea leaves does not change. So the tea leaves fall naturally!

Hahahahahahahahahahaha, I have been laughing non-stop since last night. How can bubbles burst in water? If they burst, aren’t they still bubbles? Hahaha (I am a person who can laugh and say whatever I want. I don’t mean to make fun of you!)

But I want to say something seriously! As a middle school physics teacher, you must put in more effort, thinking that today’s question is relatively simple to be honest. You have the right attitude, rather ask others than tell children incorrect answers.

I'm here to help, not to gain meaningless points. So I said some things you might not like to hear. It doesn’t matter if it’s the best answer, I hope you listen to my advice!