UBC PHAS Demonstration Room Catalog

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====== Glycerol Time Reversal ======

{{tag> glycerol glycerine dye newtonian_fluid reversible_process thermodynamics located}}

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===== Description =====

Consists of a pair of nested plexiglass cylinders with a cap on the top and bottom of the bigger cylinder, and a handle connected to the inner cylinder. There's a hole in the top that accesses the space between the cylinders, which is filled with glycerol. 

===== Purpose =====

Displays an unusual example of a reversible processes in a highly viscous liquid. After some dye has "dispersed" in the glycerol, the handle can be turned to make it all come back together.  With a reversible process, it's possible to turn back the hand of time.

===== Apparatus =====

  * Container with immersed cylinder and glycerol
  * Syringes with dye

===== Setup =====

  - Inject some dye into the container using the syringe.
  - Turn the handle to disperse the dye.
  - Turn the handle in the opposite direction to reverse the dispersion effect.

===== Notes =====

The handle can be turned a limited number of times before it is impossible to reverse the effect. Turning the handle with a jerky motion may inhibit the dye coming back together.

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| **Location** | C5 |
| **Maker** | Unknown |
| **Current State** | Working |
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