Why does the tea sink when the lid is tightly pressed on the teacup?
The inside of the cover lid cup to seal the air temperature in the cup was gradually after cooling smaller lead cup pressure decreases so attached to the tea bubble is sucked in the air buoyancy decreases so tea sank
Atmospheric pressure causes water vapor to adhere to the surface of some of the tea leaves that are about to rise, so that the draft leaves become very heavy and take advantage of the water
1 reduce the evaporation heat, keep the water temperature, ---- as time increases, tea is soaked, bubbles out of water into the tea, buoyancy decreases 2, a slight increase, the pressure on the surface of the water, so that bubble decreases, reducing the buoyancy of tea.
