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: **
** What happens when you pull water up into the vertical tube then remove the tube from your mouth? **
What happened was I got the water up to the top with a given amount of sucking pressure then i took the stopper off and the water became much easier to suck.
** What happens when you remove the pressure-release cap? **
If I remove the cap i think it will be easier, like drinking soda through a straw. Instead when i did it it was harder to suck the water up.
** What happened when you blew a little air into the bottle? **
THe bubble in the pressure indicating tube moved about a centimeter. Once the pressure was taken off the vertical tube water spewed out of it. It moved because there was pressure behind it. All these things happened because we increased the normal pressure in the system and it had to equilibriate by pushing water out of the vertical tube.
** 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: **
approximately +/- 10 N/m^2
approximately 1 cm
the air temperature would have to change by 20 percent to get a resulting change.
** Your estimate of degrees of temperature change, amount of pressure change and change in vertical position of water column for 1% temperature change: **
20-25 degrees of temperature change. We would get a resulting pressure of 15 kPa with a 1 degree change in temperature. THe water coulumn would rise half a centimeter with a 1 degree change.
** The temperature change corresponding to a 1 cm difference in water column height, and to a 1 mm change: **
10 degree difference in temp would result in a 1 cm rise in the water tube. A 1 degree difference would give us a 1 mm change in the vertical tube.
** water column position (cm) vs. thermometer temperature (Celsius) **
23.1 degrees celsius, 9 cm initially, -.1, -.1, -.2, -1cm, -2cm, -2.2cm, -2.6cm, -3cm, -3.8cm, -4.1cm, -5.0cm, -5.6cm, -5.9cm, -6,8cm, - 7cm, -7.7cm, -8.3cm, -9cm.
** Trend of temperatures; estimates of maximum deviation of temperature based on both air column and alcohol thermometer. **
The temperature did not change at all during the ten minutes. There was no deviation of the temperature. The basis for my estimate is the fact that the temperature never changed.
** Water column heights after pouring warm water over the bottle: **
Ok i did this
** Response of the system to indirect thermal energy from your hands: **
My hands did not change the temperature in the air of the bottle by anything significant. My hands were not touching the bottle and air is a poor conductor of heat. If i had been touching the container then i may have seen a difference.
** position of meniscus in horizontal tube vs. alcohol thermometer temperature at 30-second intervals **
23.1 degrees celsius during the whole experiment the meniscus did not move at all. It was lying horizontal with no pressures acting upon it.
** What happened to the position of the meniscus in the horizontal tube when you held your warm hands near the container? **
Again nothing happened. I would suppose if it had gone the way it was supposed to the water would have risen in the horizontal tube maybe a centimeter or two.
** 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 there was a small increase in the pressure inside the bottle. The volume of the air inside the system would be .1 cm cubed.
The percent change in the system would be less than 1 percent.
About a 4 degree temp change would give us this resulting pressure.
The water would rise out of the tube because of the resulting temperature change.
It was stated earlier that a 1 degree change i celsius would result in about a 3 cm change in the vertical tube. I did my estimations based on this assumption.
** Why weren't we concerned with changes in gas volume with the vertical tube? **
It has no bearing on the pressure. No mater the air volume in the tube the atmospheric pressure will always be the same.
** 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 pressure would have to change by less than 10 kPa.
A 2 degree increase
a 6 degree increase.
** 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 rise approx 3 cm.
there would be 10 cm rise.
At about 45 degrees.
** Optional additional comments and/or questions: **
1.2 hours
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