Egg and salt floating experiment

Egg and salt floating experiment

Short description
Full description
Short description

Egg and salt floating experiment

Type of resource:  Web page

Web address

Language: English


Experiment with eggs, water and salt to see how salt affects the density of the water and therefore the floatability of the eggs.

Scientific concept introduced

Liquid density, buoyancy, floatability.

Creative and critical thinking

To imagine other ways of mesuring the density of liquids.

Mathematical reasoning

To be precise in the amount of salt they are using.

To develop the ability to observe and discover.

Scientific thinking

To ask questions.

To analyze and solve problems (floating).

To conduct a research (create an hypothesis about what will happen with the different amounts of salt in the water).

Learning how to learn

Feeling of self-efficacy in learning, since it is an experiment they could do on their own.

To develop their motivation to learn and engage with the activities.


Use of hand-eye coordination

Sharing ideas with other classmates

Learning science vocabulary

Full description

Egg and salt floating experiment

Overall aims

To develop the ability to observe and discover
To strengthen the research attitude of children
To improve children’s problem-solving (take initiative)
To create the learning opportunity for explaining the concepts of density and bouyancy

Vocabulary - keywords should be understood

Basic vocabulary: density and buoyancy
Other vocabulary: transparency

Expected learning outcomes (operational aims)

To run the experiment
To do a observation over time
To explain the concept of density and buoyancy
To deduce the relationship between density and buoyancy

STEM skills - to which the learning unit is related to


● Asking questions.
● Analysing and solving problems.
● Designing experiments.
● Drawing conclusions based on results.
● Motivation to learn and engage.
● Self-discipline and self-regulated learning (cognitive autonomy).


● Sharing ideas
● Hand-eye coordination
● Taking common decisions
● Creativity: design other buoyancy experiments

Teaching methodologies/activity outline

1- Ask questions about personal experiencies about buoyancy. For exemple: Is the same when you swimming in the sea or swimming in the pool? Where you float the most?

2- Give them time to experiment with the egs and the salt.
3- If you can do the experiments with two or free eggs and glass, you can observed the disparity between the buoyancy depending to the amount of salt.
4- Draw conclusions about the more or less salt in the wather (density) has an impact in the buoyancy.

Assessment of learning

Initial evaluation
- Get to know the previous knowledge they could know about the same theme.


Continued evaluation
- Progressively acquire basic habits of autonomy in everyday actions, to act safely and effectively.
- Think, create and start to know basic scientific concepts (density and buoyancy)
- Observe and explore the immediate, natural and physical environment, with an attitude of curiosity and respect and gradually participate in social and cultural activities.
- Progressively acquire basic habits of autonomy in the experiment.
- Use the oral language and gesture to express ideas, desires, feelings and emotions;
- Use the oral language to explain, discuss, support a point of view
- Listen and participate actively in regular situations. Conversation and learning with the use of non-discriminatory language, and with attitude of respect towards other cultures and different languages.
- Creativite in other similar experiments about buoyancy.


Final evaluation
- To evaluate the learning objectives, use the chart in which the more important
elements will be highlighted.

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

● A raw egg or more.
● A glass that you can see through. A glass or more if you want to do a comparative experiment.
● Water.
● Salt, just regular salt you use for cooking.
● A spoon.

Kind of setting

Lab, kitchen or Preschool room

References - source


Egg and salt floating experiment

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 


Relation with local traditions of cooking (using local products)


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)

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