How to keep the tea in the teacup from floating, Zhihu?

For the first time, tea leaves floated because they were dry and there were small pores on the leaves. After soaking in hot water, the absorbed water becomes heavier, so it sinks. When hot water is washed again, because of the impact of water flow, a little small bubbles left in the tea are heated and expanded, which increases the buoyancy of the tea, and some of them can float. If washed several times, the tea leaves will not float after being fully absorbed.