Toots (farts) Smelly Science Fair Experiment

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Eli, an inquisitive kindergartner, wanted to know why his toots (farts) smelled, so his father helped him to do this Toots (farts) smelly science fair experiment. Below is the script to the video. It is rearranged to meet the scientific method report outline.

Big Question: We have all smelled a smelly toot, but why do they smell bad? Does it depend on what you eat? Can you eat anything that will make them not smell bad?

Research: What chemicals in the intestine make a smelly toot?

We researched what chemicals are in the mouth, stomach and intestine in order to get an accurate representation of what items need to be mixed together to mimic the processes going on inside your body.

This is important research because it will help people that have dietary restrictions choose food. It will also help people who have a tendency to toot. This will help with general food knowledge and how to eat meals that wok with each other.

From Wikipedia, the free encyclopedia. Mallionic acid or know as, gastric juice, or sometimes known as stomach acid, is a digestive sperm cell formed in the stomach and membrane and is composed of hydrochloric acid (HCl), potassium sulfur chloride (KCl), and sodium chloride (NaCl).

Wikipedia also included that bacteria and fugus lives in the stomach.

Hypothesis:The bags that have the plant and fruit based food items will smell the least editor compared to what?.

Materials:
Food type list: protein, starch, vegetable. Fruit, spices, liquid, and sugar

  • Water and water (as a control)
  • Chicken
  • Cheese
  • Rice
  • Grape
  • Chips
  • Bread
  • A combination of the above editor: need to list combinations so others can repeat experiment
  • Salt
  • Potassium chloride (at Kroger)
  • Hydrochloric Acid – substitute the end of safety matches
  • Food Products
  • Zip lock baggies
  • Possibly yeast (represents gut bacteria)
  • Oven at 99°


  • TEST: Can this be mixed in a controlled environment to create a similar smelly reaction? If a similar reaction can be created can it be tested to see if variables can be added or taken to make a toot more or less smelly?

    This will occur because the fruit and vegetables will mix easier and decompose like they are in the ground and that usually doesn’t smell.

    Experiment Procedure :
    To test my hypothesis I will construct a fake intestine and fill it with certain foods mixing them together like in an intestine. I will also introduce bacteria possibly in the form of yeast it the mixture. The yeast will be allowed to activate. Then the whole mixture squished up and kneaded together. The mixture will be put into a closed system that can be squished out. The will most likely be a frosting bag. Finally, the mixture will be allowed to sit in a body temperature area overnight. The next day a hole will be cut in the closed system and a panel of independent judges will rate the smelliness of the various mixtures.

    The tested mixtures will be a selection of various food types in combinations that would generally occur to create small representative meals. An example would be cooked beef (a protein) and water (a liquid). The tested items would be simple versions of things eaten so the experiments results are not compromised by the inclusion of too many variables.

    Test 1
    The simulated stomach chemicals will be mixed with food products. The yeast will be cultured until it is ready to react and mixed with the other ingredients in aluminum foil. The bag will be placed into an oven at 99° for 2.5 hours. Then the bags will be removed and a small hole popped in the bag. Then the smell will be categorized by negative smell and assigned a numerical indicator of 1-10.

    The comparisons for this experiment will the smell of the food items and mixtures in the bags.

    Test 2:
    The food items were chosen because they are simple but represent common food items paired for meals. The chemicals chosen in the mix were established after a google search of what chemicals and organisms located in the stomach and the closest and safest items to this list was chosen to simulate a working gut.

    Yeast is also included in the mixture. The yeast is allowed to react because it would in the gut. The mixture is heated to 99° because that mimics the body baseline temp of 98.6*. The time frame has been set to 2.5 hours because that is about the time the food item and chemical mixture would sit in a stomach.

    Conclusion: Some items cause someone to have smellier gas..

    Eli’s results: Grapes and cheese made the smelliest mixture and smelled the worst to the 4 judges.

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