Lab Report on Energy

Anton Johansson, 9E

1. Water and Insulation

1.1. Planning

1.1.1 Description of Lab

What change of temperature drop will there be if the object is insulated differently? This question was to be answered as the lab was made. A bottle of water is warmed up with a bunsen burner, and the water is then poured into two different tubes, one normal glass tube and one insulated with styrofoam. The both tubes’ temperatures will then be checked with continuality every sixty seconds for ten minutes. The numbers will then be listed in a table steadily showing the way down for both temperatures.

1.1.2 Equipment and Materials Needed for Lab

· Bunsen burner to boil the water

· Glass bottle to boil water in

· Holder for glass bottle

· Two equivalent glass tubes

· Holder for the two tubes

· Two high temperature thermometers

· Tong for the glass tubes

· Pen and paper for noting results etcetera

1.1.3 Diagram of the Equipment’s Set Up

The equipment for the lab is to be set up as follows on the diagram shown below. The bunsen burner is placed under the holder for the glass bottle filled with water. As the water is boiling, the next step is then to pour the liquid into to tubes, both placed upon each holder, one tube being insulated. This is marked as ”2” on the diagram.

Lap report set up

1.1.4 Hypothesis

My prediction of the results for this lab would be that the both temperatures will fall pretty steady, with about five degrees Celsius per minute, but that the non-insulated tube’s temperature will fall with a couple of more degrees than the insulated. The insulated easier keeps the temperature as Styrofoam is an object that is worse leading energy than air, that revolvs around the other tube. As energy is equal to warmth, it means that air easier brings away the heat, and therefore that the tube that’s not insulated will have a temperature which drops in degrees faster. Summary of my hypothesis, then: the both tubes will start at the same temperature (about 90 degrees Celsius, I believe, as it was boiling only seconds before) at 0 minutes. As the time goes, the temperature of both will drop steadily, but as the non-insulated tube’s drops with about five degrees, the insulated’s drops with about three degrees on the same time, because of the Styrofoam’s worse energy leading capacity.

1.2. Performance & Conclusion

1.2.1 Results

See the attachment.

1.2.2 Conclusions

The black tube had a temperature which steadily dropped from beginning at 0 degrees Celsius to have reached 45 degrees after ten minutes, which was the highest drop. As for the others, the temperature dropped heavily on the first step, as the water temperature adapted to the sudden change of temperature (when the heating thermal energy of the Bunsen burner was taken away), and in this case the drop was five degrees, which also was a record for the lab. Another heavy drop was recorded between the second and third minute, six degrees, but after that the drop was steady with one or two degrees per minute.

Together with the black tube, the shiny tube was the only to have a temperature starting on 64 degrees (that the others weren’t was probably a miscounting, or that the other tubes were filled with water too much later). Here as well as for the black tube, heavily drops of temperature were made in the beginning, even though the first minute’s drop isn’t as large as the black’s first, being three instead of five degrees. Something interesting later developed as the temperature stayed the same (56 degrees) for three minutes (4 – 6), till it dropped two degrees at once. After this, the temperature dropped by one degree per minute till it was on 51 degrees after ten minutes.

The insulation clearly helped for keeping the temperature. It is much harder for the thermal energy to leave the tube when it is trapped inside Styrofoam, since it is a bad conductor of it. The temperature started at 58 degrees (see last paragraph) and barely developed anything, staying on the very same degree for two or three minutes in a row. Ending on 54 degrees, it only changes four degrees, while for example the black tube change 20.

The copper tube’s temperature drop was quite steady, starting at 59 and after ten minutes being on 48 degrees. It varied a lot from dropping one and two degrees, once staying on the same temperature for two minutes. I would have expected a bigger jump for the first minute, otherwise it is as I expected.

It all appeared to be quite a lot as I expected it to, even though I thought that there would be larger temperature; what I expected was about five degrees per minute turned out to be a median of one or two. I hadn’t thought much of difference between the three (excepting the insulated one) and I was kind of right about this since this fourth tube clearly stood out from the rest. I have afterwards realised that the black colour much easier conduct thermal energy than the shiny and the copper.

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