Brittany Boone 12/1/2013

Transcription

1 THERMODYNAMICS PROJECT II Human Entropy Is the male and female internal disorganization equal? 12/1/2013

2 For my project I decided to use an everyday example to explain entropy. To this I decided to measure the entropy generated by random individuals. After gathering the data and preforming the necessary calculations, I then compared the results between men and women. This involved some calculations, including dimensional analysis. I also got to ask people embarrassing questions. It turns out that not many people are willing to share their weight and food consumption. Approximately seventy five percent of people I asked had no idea what their calorie intake was per day. Surprisingly, initially I got more women than men to participate. This is not what I expected at all; that, however, is an entirely different research topic. My hypothesis to explain this difference is that woman keeps track of their weight and food consumption because they are more conscious of their body image than most men are. Entropy is the study of the measure of disorder within a system. My goal is to determine if the weight and gender of a person affects their internal disorder. To do this I first had to convert kilocalories into kilojoules. I then converted pounds to kilograms. I did this because the entire semester we have worked in SI units. Besides, British thermal unit per pounds times degrees Rankine is just an awkward unit of measurement. After doing the dimensional analysis, I calculated the total entropy change (ΔS) of each individual. To do this I took the individual food consumptions in kilojoules and divided that by the average human body temperature in degrees Kelvin. After calculating the total entropy change (ΔS) of each individual, I then calculate the specific entropy change (Δs) of the individuals. To do this I divided the total entropy change by the persons mass. This gives me a result in kilojoules per kilogram times Kelvin. These are the units of measurement that we have been using in class. In conclusion, based on an average among the sexes, women have higher entropy than men. Comparing the numbers individually between a man and a woman, they are similar and in some cases the same. However; when you take the averages the difference becomes clear. I found these results to be surprising. I would have expected that men would have higher entropy. This is because on average men do not keep track of their food consumption. I would have thought that this would result in a higher internal disorganization due to the ingestion of more energy than is needed.

3 Male Conversions KiloCalories Weight(lbs) Kilojoules Weight(kg) Total Entropy (ΔS) Internal Entropy (Δs) Averag e kj/k kj/kg*k

4 Female Conversion Kilocalories Weight(lbs.) Kilojoules Weight(kg) Total Entropy (ΔS) Internal Entropy (Δs) Average kj/k kj/kg*k

5 References C engel, Yunus A., and Michael A. Boles. "Chapter 7." Thermodynamics: An Engineering Approach. 7th ed. New York, NY: McGraw-Hill, Print. Equations used: kj=kcal* kg=lbs/2.2 Δs=ΔS/m