VideoViernes 20MAY

el video viernes de esta semana cumple con una labor educativa

se trata de la explicación cientí­fica del famoso video de los mentos y la cocacola light.

«Water molecules like to be next to other water molecules, so basically anything that you drop into the soda that disrupts the network of water molecules can act as a growth site for bubbles,» Coffey told New Scientist. «And if you have rough candy with a high ratio of surface area to volume, then there’s more places for the bubbles to go.»

Low surface tension also helps bubbles grow quickly. Measurements showed that the surface tension in water containing the sweetener aspartame is lower than in sugary water, explaining why Diet Coke creates more dramatic fountains than sugary Coke.

Another factor is that the coatings of Mentos contain gum arabic, a surfactant that further reduces surface tension in the liquid. Rough-surfaced mints without the surfactant did not create such large fountains.

Mentos are also fairly dense and sink rapidly, quickly creating bubbles that seed further bubbles as they rise. Crushed Mentos that fell more slowly created puny fountains that only travelled about 30 centimetres.

«Middle-school teachers are getting their students out onto the baseball field next to their school and doing this reaction, and their students love it,» says Coffey. «It’s a great way to get students excited about science and learn something new.»

Mentos-Diet Coke Explosions Explained: