Test for fats in Food Component – Class 7 Science Experiment

Chapter Name: Food Component

Activity Name: Test for fats in Food Component

Activity Description:

Test for fats in Food Component - Class 7 Science Experiment

The experiment aims to test the presence of fats in various food samples using a simple method of rubbing them on a piece of paper to check if it turns translucent.

Required Items:

  1. Various food samples to be tested (e.g., vada, oil, butter, etc.)
  2. Pieces of paper

Step by Step Procedure:

  1. Gather the different food samples you want to test for the presence of fats.
  2. Take a small quantity of each food sample and place it on separate pieces of paper.
  3. Gently rub the food sample on the paper using your fingers.
  4. Observe the paper after rubbing each food sample.

Experiment Observations:

If the paper turns translucent (partly transparent) after rubbing a food sample on it, it indicates the presence of fats in that particular sample.

Note down your observations in below table format

Test for fats in Food Component - Class 7 Science Experiment


  1. Use small quantities of food samples for testing to avoid wastage.
  2. Ensure that the paper used is of good quality and not too thin, as it might tear during the rubbing process.
  3. Wash your hands before and after handling each food sample to prevent contamination.

Lesson Learnt from Experiment:

The experiment demonstrates a simple and quick method to test for the presence of fats in food samples. Fats are hydrophobic substances, and when rubbed on paper, they create translucent spots due to the paper’s semi-permeable nature. This method is not quantitative but can give a basic indication of the presence of fats in different food items.

As a side note, the reason the paper plate turns translucent when you place oily or fatty food like vada on it is due to the same principle. The fats from the food seep into the paper plate, causing it to become semi-transparent in those areas where the fats are absorbed. This is especially noticeable with thin and low-quality paper plates.

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