How does the type of fabric (pure cotton, polyester, and silk) affect the evaporation rate of water when exposed to a constant temperature, as measured by grams lost per hour?HL
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7
Official IB Result
IB Grade: 7
Criteria A: Research Design
4/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Good
A.3Methodology description
Good
Criteria Feedback
- The student frames a focused, testable question and places it in a relevant scientific context by linking fabric behaviour to moisture management and fibre properties.
- The student's method includes several purposeful controls and replicates, which shows awareness of fair comparison and comparative data collection.
- The procedure is detailed enough that the investigation could be followed with some confidence, especially in the core measurement and timing sequence.
- The stated constant-temperature context is not matched by the procedure, because the oven temperature drops substantially during the trial.
- Some important variables are not controlled or explained in enough detail, including fabric source, weave, thickness, placement in the oven, and the exact saturation method.
- The methodological rationale is more descriptive than explanatory, so several design choices are not fully justified in terms of how they improve validity and reliability.
Criteria B: Data Analysis
3/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Excellent
B.2Consideration of uncertainties
Poor
B.3Data processing quality
Moderate
Criteria Feedback
- The data are organised clearly into raw and processed tables, making the path from measurement to analysis easy to follow.
- The student shows their calculations and uses mean values to compare the fabrics over time, which creates a clear basis for comparison.
- The graph supports communication of the overall trend and makes the differences between materials easy to see.
- The processing relies too heavily on a single average rate across the whole trial, even though the temperature changes substantially and the curves are not perfectly linear.
- Uncertainty is only minimally addressed, with no spread measures, error bars, or quantitative treatment of replicate variation.
- The comparison is weakened by the very unequal starting water masses and by a lack of normalization or statistical support for claims of difference.
Criteria C: Conclusion
3/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Good
C.2Scientific context comparison
Poor
Criteria Feedback
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Criteria D: Evaluation
4/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Improvements
Excellent
Criteria Feedback
- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.