LB: Trial 3 Results

LB: Trial 3 Results

Figure 4:  Photos used to derive values for surface area

Figure 1 uses image-j numbers

You'll notice that of the two methods, I've decided to take only image-j's values for surface area. This is because I think that taking data from different sources and treating it as one set of numbers will increase the difficulty of following these processes, as well as complicate identifying errors. Hence, only one method should be used at this stage, of trials.

As to why image-j was chosen over manual, it is more accurate in measuring areas in the 2D photo . The different radii in figure 2 indicate that the GRB are still not perfectly round, though the difference is smaller than in previous trials and this compromises the accuracy of the manual method. There is no need to find out the radius for calculating areas of spheres and besides I think it is more useful to measure the 2D photo well, since all the GRB are of the same thickness anyway.

Illogical Density 

In figure 1, the uncooked 20g flat is less dense than water, which shouldn't be considering it sank. There are a few other points of contention as well, such as 2/3 of the GRB getting significantly denser (but floating) after cooking. Discussion with my teacher (Ms Tan Beng Chiak) still concluded that this experiment hinged on accurate measurements; if I continue trying to improve experimental method, then ideally at the end I can obtain results that show the GRB getting less dense.

Surface Areas in Figure 2

If density can show how the GRB floats, then surface area is a possible reason as to why. In figure 2, the surface areas before cooking from the two methods are reasonably close, but the areas after cooking differ up to 10 cm². The reasons presented above for using image-j may still stand, but this large difference needs to be addressed in future experiments as well.

Surface Areas in Figure 3

Linked to the above issue, surface area doesn't seem to predict when the GRB will float, but it is possible to get more accurate measurements of surface area.