Science Illustrated

WATER BUBBLES WILL REPLACE PLASTIC BOTTLES

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Bubble consists of algae

The skin of the bubble is alginate salt extracted from algae. It's a polysaccha­ride, A carbohydra­te of molecules in long, negatively charged chains. The salt includes sodium.

Thickener is added

The alginate salt is dissolved, and calcium chloride is added. The substance is a gelling agent, which is often used in cheesemaki­ng to cause the product to be thicker.

Gel is produced

Calcium ions replace the sodium ions. Each ion binds to two alginate chains at the same time, linking the chains in a gel. The sodium ions combine with the chloride ions to form cooking salt.

Gel is broken down

The gel forms a bubble, which fills with water. The bubble is opened by taking a bite, after which the water inside can be sucked out. The alginate gel can be eaten or broken down naturally as quickly as fruit.

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