This experiment for our little scientists seems appears as a little magical, nevertheless it is a pure science.
We have performed this experiment using five layers to keep 4-year-child attention long enough to make it interesting. This is also a great opportunity to explain what density is.
In our experiment we use:
A. LIQUIDS for layers (starting from the bottom):
1. Honey – density 1400 kg / m3
2. Dish soap – density 1060 kg / m3
3. Water – density 1000 kg / m3
4. Vegetable Oil – density 920 kg / m3
5. Alcohol (98%) – density 790 kg /m3
B. Food dyes:
1. Green for water
2. Red for alcohol
C. Glass container
Explanation for pros:
An object’s density is calculated by dividing its mass (weight) by its volume (the amount of space it occupies). The more dense object is the more mass it has in a given volume. Therefore denser object stays under the object having lower density.
What is important for a density tower you also need to use the right types of liquids – those in neighboring layers must be immiscible -that is, they do not mix. Take a moment to check that in our experiment we separated water and alcohol with a layer of oil! This is because of the fact that water and alcohol are miscible and can not be next to each other although their densities differs enough to make in theory two separate layers.
Do you know what percent of Iceberg flows under the water?
You can solve this question by comparing their densities. Density of water (1 kg /m3) and ice density (0,917 kg /m3). As long as we know that iceberg is floating on water, we can calculate that over 90% of iceberg is hidden under water.
All can be concluded by 2 statements:
– Archimede’s Principle of bouyancy states that the bouyant force on an object is equal to the weight of the fluid displaced by that object.
– The underwater fraction of a substance floating on water is given by that substance’s mass density in g/cm³.
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