Energy in Food

|Weight (grams) | t Before (°C) | t After (°C) | t difference (°C) |Energy in food per gram (joules) |t difference (%) | | |Bread |0.49 |22 |27 |5 |525 |22.72 |Max & Michael | |Peanut |0.38 |24 |47 |23 |2415 |95.83 |Group 1 | |Meat |0.78 |21 |40 |19 |1995 |94.47 | | | | | | |

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|Bread |756 | |07.20 |

|Peanut |2268 | |21.60 |

|Meat |399 | |03.80 |

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Formula for energy in food per gram

We use the fact that it takes 4.2 joules to heat 1ml of water by 1 °C

Energy in food = rise in t of water (or t difference) x 25 x 4.2

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Discussion

How much energy is stored in different types of food?

Food and other living organisms can be burned in order to measure energy that living org. contains

We used peanuts, dried bread and dry meat for our experiment. By burning food, the heat given off can be calculated. Before we put food on fire, we place 25ml in a tube and determine its...