
Plant Fats vs. Animal Fats on Paper
Easy
Do butter and vegetable oil behave the same way even though one comes from animals and the other from plants? Both are fats, but they differ in some surprising ways.
You melt butter and oil in separate bags using warm water. Then you dab each one onto brown paper and watch what happens. Both leave a greasy mark that soaks through the paper. But when you place the bags in cold water, the butter turns solid again while the oil stays liquid.
You also test whether oil and water mix. They do not. But oil and melted butter blend together easily. The experiment shows that plant and animal fats share some traits but differ in how they respond to temperature.
Hypothesis
The hypothesis is that fats from plants and animals have both similarities and differences.
Method & Materials
You will compare butter and vegetable oil by observing them in different ways.
You will need butter, vegetable oil, a brown paper bag, wax paper, scissors, water, masking tape, a plastic straw, zip-closing plastic bags, clear plastic cups, cotton swabs, a bowl, and a ballpoint pen.
Results
The experiment showed that fats from plants and animals have both similarities and differences. The butter and oil soaked through the brown paper bag, felt greasy, and did not dissolve in water. The milk fat in the butter had a structure that allowed it to be shaken until it became solid, while the oil could not be melted and resolidified.
Why do this project?
This science project is interesting and unique because it allows students to explore the differences between plant and animal fats in a fun and engaging way.
Also Consider
Experiment variations to consider include comparing different types of plant fats, such as corn oil, olive oil, and peanut oil, or comparing fats to other substances, such as cheese, soap, and beeswax.
Full project details
Additional information and source material for this project are available below.Related video
These videos explain the science behind this project and demonstrate key concepts used in the experiment.
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