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: **
Good Evening, still working on wrapping up the remainder of the labs.
All of my test should have been sent by now via mail. Just let me know if you haven't received them; and I will follow up with my proctor.
Thanks David.
** What happens when you pull water up into the vertical tube then remove the tube from your mouth? **
The water remained somewhat elevated; although it gradually fell to a point of equilibrium.
** What happens when you remove the pressure-release cap? **
If I elevated the tube, then the water would escape the vertical tube. back into the bottle; as I had expected
** What happened when you blew a little air into the bottle? **
Water flowed back through the vertical tube (into my mouth I might add, good thing it was clean potable water)
The pressure in the system compressed the air column in the pressure indicating tube; thus causing it to move. Yes gradually it moved back to it's original position.
It filled with the liquid
The system basically acted as I had assumed it would. Partially because of personal experience, and partially as a result of the observing the video experiments.
** 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: **
It would increase or decrease by 1000 N/m^2
** Your estimate of degrees of temperature change, amount of pressure change and change in vertical position of water column for 1% temperature change: **
71deg x .01 =.71deg
(2.01 x 10^5 Pa (345T))/ 344T = 201.5 kPa
(210 x 10^-6)(.5L)(1C) = 1.05 x 10^-4L = .105cm^3
** The temperature change corresponding to a 1 cm difference in water column height, and to a 1 mm change: **
.18cm/[210 x 10^-6 (21.6C)]= .4030deg C.
18.26mm/[210 x 10^-6 (21.6C)] = .00403deg C.
Applied the formula for volume expansion
** water column position (cm) vs. thermometer temperature (Celsius) **
22.2, 0
22.8, 0
23.1, +
23.1, +
23.0, +
23.0, +
22.9, +
22.5, 0+
22.8, +
22.8, +
22.5, +
22.3, +
22.1, +
22.1, +
22.1, +
22.0, + (Highest Point from 0)
22.0, +
22.0, +
22.0, +
22.0, +
22.0, +(Highest Point from 22.0)
** Trend of temperatures; estimates of maximum deviation of temperature based on both air column and alcohol thermometer. **
The temperatures varied as much as 1deg C throughout the 10 minute experiment. The alcohol Themometer seemed to be more sensative to small
variations in the temperature of the room overall.
** Water column heights after pouring warm water over the bottle: **
22degC
2mm
4mm
6mm
6mm
6mm
6mm
6mm
6mm
6mm
6mm
6mm
6mm
** Response of the system to indirect thermal energy from your hands: **
To my surprise, the presence of my hands did in fact warm the air in the bottle measurably. It raised the the fluid levely by 1mm.
** position of meniscus in horizontal tube vs. alcohol thermometer temperature at 30-second intervals **
22, 0
22, 0
22, 0
22, 0
22, 0
22, 0
22, 0
22, 0
22, 0
22, + (very Slight)
** What happened to the position of the meniscus in the horizontal tube when you held your warm hands near the container? **
Possibly a minor amount of change was noticable.
But certainly less change than that observed during the vertical tube experiment.
** 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: **
The horizontal section required much less pressure to move the fluid across the section of pipe. I would imagine probably half as much.
** Why weren't we concerned with changes in gas volume with the vertical tube? **
** 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: **
** 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: **
** Optional additional comments and/or questions: **
Your work here looks good.