Phy 122
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? **
When I removed the tube from my mouth the water feel back into the bottle. My tongue was holding that pressure in the bottle which allowed the water to be sucked up and stay in the tube. Once released, it fell.
** What happens when you remove the pressure-release cap? **
Pressure will escape because it is going from a higher pressure to a lower pressure system. It did exactly that.
** What happened when you blew a little air into the bottle? **
The air column moved up as I blew, but then went back to the original position when I removed the tube from my mouth. When I blew, the air increased the pressure and caused the water to move. It did move back to its original position.
** Your estimate of the pressure difference due to a 1% change in pressure, the corresponding change in water column height, and the required change in air temperature: **
<1N/m2
.25cm
5 degrees Farenheight
If the pressure changed by just 1%, that is very insignificant, under 1 N/m2. The height in the air column would be very small, only millimeters. This change would require 5 degrees of change being that I only have 10cm of water in the tube.
** Your estimate of degrees of temperature change, amount of pressure change and change in vertical position of water column for 1% temperature change: **
1 degree
10kpa
1millimeter
I based these assumptions out of 100. A 1% change in temp is 1 degree. The same goes for pressure change and vertical position.
The temperature scale must be an absolute scale. 100 degrees on a Kelvin scale would be about 300 degrees below zero, Fahrenheit. Outside right now, on a fairly chilly night, the temperature is about 270 Kelvin. Room temperature is close to 300 Kelvin.
** The temperature change corresponding to a 1 cm difference in water column height, and to a 1 mm change: **
10degrees
1 degree
Based on my assumptions above.
** water column position (cm) vs. thermometer temperature (Celsius) **
21.2, 10cm
21.2, 10cm
21.4, 10.5cm
21.4, 10.5cm
21.6, 10.8cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.6, 10.8cm
21.6, 10.8cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
21.4, 10.5cm
** Trend of temperatures; estimates of maximum deviation of temperature based on both air column and alcohol thermometer. **
The temperature didn't change that much over the 10 minutes. It stayed within 21 degrees C. The deviation was not very different. My estimate is so because I watched the temperature not change that much.
** Water column heights after pouring warm water over the bottle: **
21.4
The water column raised 1.75cm
** Response of the system to indirect thermal energy from your hands: **
My hands did not warm the air in teh bottle measurably. I tend to have cold hands most often so maybe that is why?
** position of meniscus in horizontal tube vs. alcohol thermometer temperature at 30-second intervals **
21.4, 12cm
21.8, 13cm
21.8, 13cm
21.4, 12cm
21.4, 12cm
21.4, 12cm
21.4, 12cm
21.4, 12cm
21.4, 12cm
21.4, 12cm
** What happened to the position of the meniscus in the horizontal tube when you held your warm hands near the container? **
I noticed the meniscus move only millimeters.
** 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: **
I think it changed a great bit. I think it dropped.
The volume of air would changed very little.
The answer would double
** Why weren't we concerned with changes in gas volume with the vertical tube? **
I am not sure why we weren't worried about that. To me, it seems that that would have some effect on the overall volume. I think it may have made a difference in the temperature.
** 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: **
If the tube was not completely horizontal, it would affect the temperature. Gravity could play a role in this as it would not make the acutal temperature correct.
** 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: **
It would increase 13 cm
** Optional additional comments and/or questions: **
3 hours
** **
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