Christmas Day - 2017
In spite of two back to back snow and ice events, the roads were in good condition for travel on Christmas Eve and Christmas Day, We gathered at my mother's house in New Boston on Christmas Day for a ham & turkey Christmas dinner.
A Teddy Bear sports the Santa hat my dad used to wear
Streaming some Christmas tunes
My sister Susan did a great job on food preparation for both Christmas Eve & Christmas Day
Ginny enjoys a laugh
Isaak & Joshua zone out with the little screens
Jesse sports his Smith Brothers beard
It was nice spending some time with my grandnephew Alex
My sister has a new sewing machine than can do some fancy stitching
Forget the television image, we had the real thing
Alex prepares for a gas attack
A new sleeping bag for a junior fireman
Here is a classic from my childhood, the drinking bird and it still fascinating to watch
Source Wikipedia
The drinking bird is a heat engine that exploits a temperature difference to convert heat energy to a pressure difference within the device, and performs mechanical work. Like all heat engines, the drinking bird works through a thermodynamic cycle. The initial state of the system is a bird with a wet head oriented vertically.
The process operates as follows:[5]
- The water evaporates from the felt on the head.
- Evaporation lowers the temperature of the glass head (heat of vaporization).
- The temperature decrease causes some of the dichloromethane vapor in the head to condense.
- The lower temperature and condensation together cause the pressure to drop in the head (by the ideal gas law).
- The higher vapor pressure in the warmer base pushes the liquid up the neck.
- As the liquid rises, the bird becomes top heavy and tips over.
- When the bird tips over, the bottom end of the neck tube rises above the surface of the liquid.
- A bubble of warm vapor rises up the tube through this gap, displacing liquid as it goes.
- Liquid flows back to the bottom bulb (the toy is designed so that when it has tipped over the neck's tilt allows this). Pressure equalizes between top and bottom bulbs.
- The weight of the liquid in the bottom bulb restores the bird to its vertical position
- The liquid in the bottom bulb is heated by ambient air, which is at a temperature slightly higher than the temperature of the bird's head.
Chocolate is always a nice touch
A group photo, but my exposure speed was a bit too slow, some blurring.
www.poltrack.net
 |
| A Teddy Bear sports the Santa hat my dad used to wear |
|
| Streaming some Christmas tunes |
 |
| My sister Susan did a great job on food preparation for both Christmas Eve & Christmas Day |
 |
| Ginny enjoys a laugh |
 |
| Isaak & Joshua zone out with the little screens |
 |
| Jesse sports his Smith Brothers beard |
 |
| It was nice spending some time with my grandnephew Alex |
 |
| My sister has a new sewing machine than can do some fancy stitching |
|
| Forget the television image, we had the real thing |
 |
| Alex prepares for a gas attack |
 |
| A new sleeping bag for a junior fireman |
 |
| Here is a classic from my childhood, the drinking bird and it still fascinating to watch
Source Wikipedia
The drinking bird is a heat engine that exploits a temperature difference to convert heat energy to a pressure difference within the device, and performs mechanical work. Like all heat engines, the drinking bird works through a thermodynamic cycle. The initial state of the system is a bird with a wet head oriented vertically.
The process operates as follows:[5]
|
 |
| Chocolate is always a nice touch |
 |
| A group photo, but my exposure speed was a bit too slow, some blurring. |
www.poltrack.net
Comments
Post a Comment
I'd like to hear from you