Disappearing ink – diffusion

Disappearing ink – diffusion

Short description
Full description
Short description

Disappearing ink - investigating the process of diffusion

Type of resource: You Tube

Web address https://www.youtube.com/watch?v=U8K-YDZLME8

Language: English


Observing the process of diffusion of ink in the hot and col water, investigating the qualities of diffusion in different liquids.

Scientific concept introduced

Diffusion, mixing, permeation (infiltration), dissolving.

Creative and critical thinking

Creative thinking - curiosity

Mathematical reasoning

Mathematical thinking - measuring ingredients

Scientific thinking

Observing, asking questions, predicting (formulating hypotheses), analyzing, drawing conclusions

Learning how to learn

Cognitive curiosity, motivation and engagement, independence in learning, reflexive learning


Fine motor skills,Teamwork - sharing responsibility for a common task, Language competence - enriching vocabulary, interpersonal communication

Full description

Disappearing ink - investigating the process of diffusion

Overall aims

- investigating the qualities of ink and vinegar,
- Introducing the concept of diffusion,
- rozwijanie umiejętności krytycznego i logicznego myślenia, rozumowania, argumentowania i wnioskowania,
- rozwijanie kreatywności i pomysłowości dzieci,
- rozwijanie umiejętności manualnych,
- doskonalenie umiejętności odmierzania składników

Vocabulary - keywords should be understood

diffusion, mixing, permeation (infiltration), dissolving

Expected learning outcomes (operational aims)

- explain the process of diffusion;
- measure precisely the necessary ingredients;
- conduct the experiment independently following teacher’s instructions;
- observe and draw conclusions

STEM skills - to which the learning unit is related to


Scientific thinking: observing, asking questions, predicting (formulating hypotheses), analyzing, drawing conclusions

Creative thinking

Mathematical thinking - measuring ingredients

Learning how to learn - cognitive curiosity, motivation and engagement, independence in learning


Fine motor skills, 

Teamwork - sharing responsibility for a common task

Language competence - enriching vocabulary, interpersonal communication

Teaching methodologies/activity outline

1. Introduction - Building problem situation - presenting the materials to children with the question: What could we do with these? What kind of experiment can we conduct using such ingredients?


2. Formulating hypotheses


3. Verifying hypotheses - Conducting experiment 1, following the instruction:
- Divide children into teams
- Prepare 2 empty glasses - pour cold water into one glass, and hot water into the second glass
- Add 5 drops of ink to every glass and mix. Observe the results.


4. Summarizing experiment - drawing conclusions:
- Questions: What can you observe? What happened with the ink in hot water? What happened with the ink in cold water and why?
- Explanation: introducing the concept of diffusion


4. Experiment 2 - Research question: What will happen if now we add vinegar to both glasses?
- Formulating hypotheses
- Verifying hypotheses - add 1 tablespoon of vinegar first to the glass with warm water and observe (the substance becomes blue again as if the ink appeared again).

- Add 1 spoon of vinegar to the glass with cold water and observe (now in both glasses the color is the same)


5. Summarizing the experiment 2 - drawing conclusions: Question: What happened in the glass with hot water and why? How can we explain this process?

6. Experiment 3 - ink and oil.
Research question: What shall happen if we use oil instead of water? Will the ink disappear?
Formulating hypotheses

7. Verifying hypotheses - conducting experiment:
- Add 5 drops of ink to the glass with cold oil. Observe - what happened and why? Why did the ink not dissolve? (we can see drops of ink floating in the oil)
- Add 5 drops of ink to the warm oil and observe. What happened? Try to mix both substances again carefully

- Add vinegar to both glasses, mix carefully and observe - what happened? How does the ink behave and why?


8. Summarizing the experiment - drawing conclusions:
In warm liquids the diffusion comes faster - temperature is a very important factor.

Assessment of learning

Teacher’s assessment - observing children during activities, asking questions during experiments

Equipment and materials to be used in learning unit (tools, ingredients etc)

glasses, cold water woda, hot water, ink, vinegar, oil, spoon

Kind of setting


References - source

Educational movie for a teacher: https://www.youtube.com/watch?v=U8K-YDZLME8
Explanation: https://epodreczniki.pl/a/dyfuzja/D1BQgMqcJ

Diffusion is the net movement of anything (for example, atoms, ions, molecules, energy) from a region of higher concentration to a region of lower concentration. Diffusion is driven by a gradient in concentration - a substance or collection undergoing diffusion spreads out from a point or location at which there is a higher concentration of that substance or collection. The word diffusion derives from the Latin word, diffundere, which means "to spread out."
The rate of diffusion depends on the temperature.


Disappearing ink - investigating the process of diffusion

1. Usefulness for STEM education - integrating content of different disciplines

Cross-curricular character of the resource 


The range of S-T-E-M subjects included 


The presentation of possibilities of including artistic activities (STEAM approach)


2. Expected learning outcomes

Consistency (links) with preschool core curriculum


Communicativeness of description


3. Methodology of teaching

Clarity, communicativeness of instructions for teachers


Meaningful learning - using practical life problems


Original idea 


The level of ease in implementing the methodology to preschool age children


The level of ease in preparing necessary ingredients, materials and equipment needed


4. Sustainability

Ecological characteristics of materials/ results


Supporting healthy eating habits 




Low ecological footprint


Possibilities of inclusion (respecting cultural diversity and food intolerances)


5. Class management

Using differentiated forms of work - individual, team work etc.


Individual work





Team work





Whole group




6. Time management


Short activity (10-15 minutes)




Medium activity (20-30 minutes)




Long activity (1 hour or more)




Very long activity (1 day or more)


How useful was this resource?

Click on a smile to rate it! (You must be logged in)

Average rating 0 / 5. Vote count: 0

No votes so far! Be the first to rate this post.

How can we improve this resource? Share your experience with the community.

Please Login to comment
Skip to content