|
Size: 1712
Comment:
|
Size: 1747
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 11: | Line 11: |
| (attachment photo showing the fully set up demonstration) | attachment:4C31-30_02i-400.jpg |
| Line 23: | Line 23: |
| 1. Make the felt of bird wet. | 1. Make the felt of bird wet.(The more the head wet the fast the demonstration happens.) |
| Line 35: | Line 35: |
| ||attachment:DrinkingBird-01.gif||attachment other photos|| | ||attachment:DrinkingBird-01.gif||attachment:DrnkingBird.mpg || |
Drinking Bird, 4C31.30
Location:
Cabinet: [:ThermoCabinet:Thermodynamics Cabinet]
Bay: [:ThermoCabinetBayA2:A2]
Shelf: #5
attachment:4C31-30_02i-400.jpg
Description: Also called Dippy Bird or Tippy Bird.
Equipment |
Location |
ID Number |
|
|
|
150 ml. beaker |
Shelf over the |
|
Setup:
- Set up like picture above.
- Make the felt of bird wet.(The more the head wet the fast the demonstration happens.)
- Wait until you see the red liquid grow up.
Cautions, Warnings, or Safety Concerns:
Demonstration:
Put water on the felt of bird. When water evaporates, it makes the temperature of the glass head lower. This makes some of the dichloromethane(red liquid)vapor to condense. From ideal gas law, the pressure in the head of the bird drop due to the lower temperature and condensation. The difference of the pressure between the head and base of the bird causes the red liquid to be pushed up from the base. Then the head of the bird become heavy and tips over. While the bird tips over, it make air hole that can make red liquid flows back to the bottom bulb and this makes bird go back to its vertical position again. And this will occur periodically until the water on the felt of bird dry.
attachment:DrinkingBird-01.gif |
attachment:DrnkingBird.mpg |
attachment other photos |
attachment other photos |
References:
[:Thermodynamics:Thermodynamics]
[:Demonstrations:Demonstrations]
[:Instructional:Home]