Ink is squirted into a fluid and mixed in until it disappears. By precisely undoing the motions in the reverse direction, the ink becomes unmixed! The demonstration seems to defy thermodynamics in that it appears that entropy decreases...
Water moving around a cylindrical pendulum makes the cylinder swing at the vortex shedding frequency.
When fluid flows around a cylindrical object, there is a range of flow velocities for which a von Karman vortex street is formed. The...
Food coloring in glycerine is mixed by turning a drum, then unmixed by reversing. Has entropy decreased?
Ink is squirted into a fluid and mixed in until it disappears. By precisely undoing the motions in the reverse direction, the ink...
A thin wire, moving through the air, is made to vibrate in the audio range at the vortex shedding frequency.
When air flows around an object, there is a range of flow velocities for which a von Karman vortex street is formed. The shedding...
Standing sound waves in a glass pipe are made evident by the fountains of kerosene inside the pipe.
The air inside a very large glass pipe (partially filled with a fluid) is acoustically excited into a standing wave. Once resonating, the...
This is a concept question relating to Pascal's cask-bursting experiment. Imagine the experiment inverted—literally! Attach a 20-ft length of tubing to the opening of a can full of water. Turn the can upside down and raise it high. Will the...
The "tick-tocks" of five metronomes will come into synchronization when weakly coupled together.
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The five metronomes sit on a very light FoamCore® board which, in turn, is supported by two aluminum cans on their side. The support...
“Under the microscope one, to some extent, immediately sees a part of thermal energy in the form of mechanical energy of the moving particles.” —A. Einstein 1915
Tiny latex spheres in water, viewed under a microscope, undergo a kind of...
A liquid in a number of different shaped communicating vessels will find the same level in each.
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The pressure at the bottom of the fluid depends upon the depth of the fluid and not on the shape of the container. The apparatus...
