If you add 10 cm3 of water to 10 cm3 of water, you get 20 cm3 of water. Similarly, if you add 10 cm3 of ethanol to 10 cm3 of ethanol you get 20 cm3 of ethanol. Explain why the volume of the solution formed between 10 cm3 of water and 10 cm3 ethanol is less than 20 cm3 .