Experiments about density

Some students  of I2A have done, at home,  an experiment about density. They have studied what happens when some objects are immersed in water: 

Coke experiment:

A) Normal coke sinks

B) Zero coke floats between water and normal coke.

Conclusions --> Normal coke is denser than water because it has sugar. Zero coke doesn't have sugar, so it is less dense than normal coke.

Rainbow experiment:

A) Honey is at the bottom of all liquids; syrup is on top of honey; water is on top of syrup; sunflower oil is under olive oil; olive oil is under alcohol; alcohol is on top of all liquids.

B) They have their own densities and it doesn´t matter the order to add the liquids into the recipient.

Conclusions --> Alcohol is on top because it has the lowest density; honey is at the bottom because it has the highest density; syrup is under water because it is denser; olive oil is on top of water because it is less dense.