Fill a plastic bottle with hot tap water, turn it upside down, and empty the water. Immediately screw the bottle cap tightly (preferably the cap is from this bottle). Describe and explain the observed phenomena, illustrate them with photographs.
The plastic bottle is shaking, the walls are compressed in jerks (when water is poured in a stream and the pressure in it decreases), then they straighten again (when air enters the bottle during the pouring of volts). At the end, the remaining water is poured out in a trickle and the bottle does not “twitch”. Screw on the lid. After 2 minutes the bottle will shrink and then a little more. It is cold to the touch. The bottle with its warmth briefly heated the air inside itself. But soon it cooled down and the bottle too. The volume of the cooled air is less, so it shrank. And until we let the air in, it won’t straighten. Nobody canceled atmospheric pressure either. But it’s about hot water.
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