Your 'bottle thermometer' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** Your optional message or comment: **
** What happens when you pull water up into the vertical tube then remove the tube from your mouth? **
The level dropped in the vertical tube until the pressure produced by the weight of the water column balanced with the pressure of the gas in the bottle. The air column volume reduced
** What happens when you remove the pressure-release cap? **
As the cap is removed air vented from it and the water in the vertical tube dropped into the reservoir.
** What happened when you blew a little air into the bottle? **
Water enters the vertical tube to 30 cm above the reservoir surface. The air column decreases a proportionate amount of 5mm. My system has a leak somewhere which I cannot find so the level of the water in the vertical tube drops slowly.
** Your estimate of the pressure difference due to a 1% change in pressure, the corresponding change in air column height, and the required change in air temperature: **
1000 Pa
10.3m
1%
** Your estimate of degrees of temperature change, amount of pressure change and change in vertical position of water column for 1% temperature change: **
3 degK
11111 Pa
10.3m
** The temperature change corresponding to a 1 cm difference in water column height, and to a 1 mm change: **
0.3 degK
0.03 degK
P/T=P/T
** water column position (cm) vs. thermometer temperature (Celsius) **
27.1, 0.01
27.2, 0.01
27.3, 0.02
27.3, 0.03
27.3, 0.03
27.2, 0.03
27.1, 0.03
27.2, 0.03
27.2, 0.03
27.3, 0.03
27.2, 0.03
27.2, 0.03
27.2, 0.03
27.2, 0.03
27.3, 0.03
27.3, 0.03
27.2, 0.03
27.2, 0.03
27.2, 0.03
27.2, 0.03
** Trend of temperatures; estimates of maximum deviation of temperature based on both air column and alcohol thermometer. **
My temperatures only deviated +-0.1 degC and the positions by +-0.01cm. The room temperature may have affected the water surface position but the lag time between the change in room temperature to change in bottled air temperature prevented evidence of a relationship in the data
** Water column heights after pouring warm water over the bottle: **
27.5 degC
3.2cm prior to addition of heat to system
23.5
20.0
16.4
13.5
11.3
9.8
8.4
7.6
6.5
5.9
5.6
5.3
4.9
4.5
4.4
4.3
4.3
4.3
4.2
4.2
4.2
4.2
** Response of the system to indirect thermal energy from your hands: **
No as there was no detectable change in pressure
This course is traditionlly taught in the winter, when ambient temperatures tend to be lower. The effect is easy to see in February; not usually so in July.
** position of meniscus in horizontal tube vs. alcohol thermometer temperature at 30-second intervals **
27.6 41.1
27.5, 41.1
27.5, 41.1
27.5, 41.1
27.5, 41.1
27.5, 41.1
27.4, 40.8
27.3, 40.3
27.2, 39.5
27.1, 38.9
I had to activate an AC unit halfway through to get a temperature change. Apparently my office is fairly stably adibatic.
** What happened to the position of the meniscus in the horizontal tube when you held your warm hands near the container? **
Water column rose quickly and with very little delay
** Pressure change due to movement of water in horizonal tube, volume change due to 10 cm change in water position, percent change in air volume, change in temperature, difference if air started at 600 K: **
By a very small amount
0.7cc
~0.04%
1.0004 Pa
None - proportional to 'dT only not to T
** Why weren't we concerned with changes in gas volume with the vertical tube? **
It was the volume change which precipitated the rise and fall of the water column
** Pressure change to raise water 6 cm, necessary temperature change in vicinity of 300 K, temperature change required to increase 3 L volume by .7 cm^3: **
588Pa
1.8K
0.07K
Bernoulli's equation and Ideal gas law
** The effect of a 1 degree temperature increase on the water column in a vertical tube, in a horizontal tube, and the slope required to halve the preceding result: **
10cc
1.3e-4 cm
6:10
By having the tube in a horizontal position the position of the water in the tube is no longer relevant to gravity - it is now only relevant to the contained volume of gas.
** Optional additional comments and/or questions: **
1440~1630 = 110min
** **
Very good work. See my notes.
&#Let me know if you have questions. &#