The Assassin's Teapot Is Weird

Summary by Krater

Steve Mould explains the physics of the Assassin's Teapot and similar fluid dynamics phenomena using demonstrations and animations, showing how atmospheric pressure and surface tension control liquid flow.

From the video

Answers: How does an Assassin's Teapot work?

• Assassin's Teapot fluid dynamics
• Atmospheric pressure in containers
• Surface tension and liquid flow
• Inexhaustible bottle magic trick mechanics
• P-n junction charge carriers and physics

What it concludes

• Liquid does not fall out of the Assassin's Teapot when the thumb covers the hole because atmospheric pressure holds the liquid in place.
• The movement of liquid through straws and bottles is driven by atmospheric pressure pushing from the outside rather than suction pulling from the inside.
• Surface tension prevents air from entering the opening of a bottle when inverted, which prevents water from flowing out.
• Surface tension acts to minimize surface area, which keeps liquid trapped inside small chambers or tubes when air cannot enter.