Calculating Body Deterioration for Chemistry Experiment

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Discussion Overview

The discussion revolves around calculating body deterioration for a chemistry experiment, specifically focusing on the decay processes in dead human tissue and the effects of preservation methods on flesh. The scope includes experimental design and methodologies for measuring decay rates.

Discussion Character

  • Experimental/applied
  • Technical explanation

Main Points Raised

  • Steve inquires about methods to calculate body deterioration, questioning whether to measure mass difference or find a decay rate.
  • Some participants seek clarification on whether the discussion pertains to decay processes in dead humans and if it is limited to microbial activity.
  • One participant suggests that weight change alone is insufficient due to potential water loss, comparing flesh to a wet sponge in dry air.
  • A proposed method involves using an airtight container to measure gas evolution from anaerobic and aerobic decay, with periodic sampling of air composition to assess decay rates.
  • The suggestion includes repeating the experiment at different temperatures to evaluate relative rates of decomposition over time.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best method for calculating body deterioration, and multiple approaches and considerations remain under discussion.

Contextual Notes

Limitations include the potential for water loss affecting weight measurements and the need for precise definitions of decay processes and conditions under which the experiments are conducted.

Stevedye56
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I have a quick question about body deterioration. How would i go about calculating this. Its for a Chemistry Experiment but since it deals with bodies I figured that it should be put into the Bio section. Should i just take the difference in mass? Or how would i go about finding the rate. I have the whole experiment planed out if it needs to be shown. Will edit it in if needed.
Thanks for looking,
Steve
 
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Are you talking about decay processes in dead humans? Are you limiting only to microbial activity?
 
The decay process in dead humans. I am testing preservation methods on flesh.
 
Weight change is not going to work. You can think of flesh as a wet sponge left out in dry air - eventually, with no decay it loses water weight.

One method:

Anaerobic decay will evolve gases, for example hydrogen sulfide comes from breakdown of protein. Aerobic repsiration (decay) evolves carbon dioxide. So, the best strategy is to have an airtight container, through which you re-circulate a fixed volume of air. Measure the changes in the composition of the air over time by sampling it periodically, like every hour.

Repeat the experiment at different fixed temperatures and you can get an idea of the relative rate of decomposition over time.
 
jim mcnamara said:
Weight change is not going to work. You can think of flesh as a wet sponge left out in dry air - eventually, with no decay it loses water weight.

One method:

Anaerobic decay will evolve gases, for example hydrogen sulfide comes from breakdown of protein. Aerobic repsiration (decay) evolves carbon dioxide. So, the best strategy is to have an airtight container, through which you re-circulate a fixed volume of air. Measure the changes in the composition of the air over time by sampling it periodically, like every hour.

Repeat the experiment at different fixed temperatures and you can get an idea of the relative rate of decomposition over time.

Thank you very much this is exactly what i was looking for :smile:
 

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