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:
Here is the second of the three missing labs. Only Measuring Atmospheric Pressure, Part II remains to be completed to satisfy my Lab requirement for PHY 242 University Physics II.
What happens when you pull water up into the vertical tube then remove the tube from your mouth?
The water that I had pulled into the tube with my mouth returned to the resevoir. The air column should have and did remain constant do to the cap being placed on it.
What happens when you remove the pressure-release cap?
I would think that the air would escape from the system since the pressure cap was removed.
What happened when you blew a little air into the bottle?
The length of the air column in the pressure-indicating tube changed length because the pressure in the system increased when I blew into. The air column moved back a little when I removed the tube from my mouth. I would have assumed that all of these changes were a result of the change in the system's pressure.
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:
A 1% change in a 100kPa system would result in a change of 1000 N/m^2.
It would also change by increase by 1%.
If the volume remains constant then the temperature would have to decrease at a similar rate since temperature and pressure are inversly proportional.
Your estimate of degrees of temperature change, amount of pressure change and change in vertical position of water column for 1% temperature change:
The original temperature was 22 Celsius degrees, so a 1% change in temperature would result in a net lower of the temperature by 0.22 Celsius degrees.
Around 4.5% increase in pressure would change the temperature by 1 degree Celsius.
It too would change about 4.5% of the original length.
The temperature change corresponding to a 1 cm difference in water column height, and to a 1 mm change:
For a 1cm difference in height of the column, the temperature would need to change by around 2 degrees Celsius.
For a 1mm difference in height of the column, the temperature would need to change by around 0.2 degrees Celsius.
water column position (cm) vs. thermometer temperature (Celsius)
22.0, 0
22.6, +2
21.8, -1
21.4, -2
22.2, +1
23.0, +3
22.0, 0
22.6, +2
21.8, -1
21.4, -2
22.2, +1
23.0, +3
22.0, 0
22.6, +2
21.8, -1
21.4, -2
22.2, +1
23.0, +3
22.1, +1
22.8, +2
Trend of temperatures; estimates of maximum deviation of temperature based on both air column and alcohol thermometer.
The maximum deviation of the temperature at any point was 1 degree Celsius, thus 3cm was the greatest change.
Water column heights after pouring warm water over the bottle:
22 Celsius degrees
The column jumped a total of 9cm over a short period and then returned to room temperature.
Response of the system to indirect thermal energy from your hands:
I could not tell a difference. Apparently, I have neutral hand temperature or poor circulation.
position of meniscus in horizontal tube vs. alcohol thermometer temperature at 30-second intervals
The results here were almost identical to the earlier measurements.
What happened to the position of the meniscus in the horizontal tube when you held your warm hands near the container?
Apparently my hands still haven't warmed up any.
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 believe the pressure might have changed no more than 45%.
706.9mm^3 = 100mm * 1.5mm * 'pi
A small percentage at the least.
A temperature increase would not be over 10 degrees Celsius.
The percentage of change would be constant but the actual change would be greater.
This was reasoned using a simple understanding.
Why weren't we concerned with changes in gas volume with the vertical tube?
It was not measured at first, so no corrections would be necessary. No significant difference would have resulted.
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:
8%
2 K
I am not sure how to solve this step.
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:
There would be a reduced change do to increased pressure resistance.
The pressure required to move the meniscus would be less.
45 degree angle from the horizontal
Optional additional comments and/or questions:
You're OK on this lab.