Phy 202
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: **
Could you explain the vertical change corresponding with temperature and pressure changes?? I understand the relation with T and P, but not how to correlate it with height.
I have had a really hard time with the past few parts of the lab. I'm really not understanding how we're supposed to be measuring temperature changes. Where does the thermometer go??? Is the alcohol thermometer the long thermometer in our lab packet?
** What happens when you pull water up into the vertical tube then remove the tube from your mouth? **
I think the water level will drop a bit until the cap is back on. This is because a great source of pressure is being taken away, causing the water level to fall back down. This is similar to, I believe to a child playing with a straw. If the child sucks the water up, and then tries to cover his/her straw with a finger, the water level falls until their finger is over it.
** What happens when you remove the pressure-release cap? **
I would think air escaped, because air was being forced up, then it was confined to just the top of the tube. When the plug was released, the water fell back down into the bottle.
** What happened when you blew a little air into the bottle? **
Hopefully I'm doing this right, but when I blow a bit of air into the tube, the pressure indicating tube exhibits a bit of water rise. After I'm done blowing, the pressure indicating tube has no water in it, but the water level in the vertical tube goes up.
I wouldn't have anticipated the water level rise in the vertical tube after blowing on it.
** 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: **
1000 N/m^2
1cm?????????
A water column of height h requires pressure rho g h to support it. If h = 1 cm, then rho g h = 1000 kg/m^3 * 9.8 m/s^2 * 1 cm; expressing 1 cm in meters and multiplying you get about 100 Pa. So 1000 Pa of pressure will support a water column significantly higher than 1 cm.
1%
1kPa=1000N/m^2, I'm not sure about the air column, Kinetic Mol Theory- P is directly proportional to T
** Your estimate of degrees of temperature change, amount of pressure change and change in vertical position of water column for 1% temperature change: **
I would think by 3 degrees
about 0.3 kPa
If temperature changes by 1%, with an insignificant change in volume, then pressure should change by 1%.
?????
** The temperature change corresponding to a 1 cm difference in water column height, and to a 1 mm change: **
This would indicate the pressure is increasing, if pressure is increasing, then temperature would increase by that amount.
** water column position (cm) vs. thermometer temperature (Celsius) **
** Trend of temperatures; estimates of maximum deviation of temperature based on both air column and alcohol thermometer. **
** Water column heights after pouring warm water over the bottle: **
** Response of the system to indirect thermal energy from your hands: **
** position of meniscus in horizontal tube vs. alcohol thermometer temperature at 30-second intervals **
** What happened to the position of the meniscus in the horizontal tube when you held your warm hands near the container? **
** 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: **
** 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: **
** **
See my notes above.
The order of the assigned experiments was wrong. The link below should help, and if you need additional data you can take it when you do the Measuring Atmospheric Pressure, Part 1 experiment that was assigned in Asst 11 (it's now been moved to Asst 9 and the bottle thermometer to asst 10). You're also welcome to ask more questions, of course.
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