小小氣泡學問大

　　11月5日VOA聽力：小吝嗇泡學問大

　　Under ultraviolet light greasy residue on humanhands becomes visible, but trying to rinse it off withordinary cold water is next to impossible.

　　Infusing the water stream with a bit of ultrasoundturns it into an effective scrubber that quickly andharmlessly rinses the skin to spotless clean.

　　The simplicity of ‘Starstream,’ invented by two researchers from the University ofSouthampton, England, promises to change the way we clean our bodies as well as objects weuse, from kitchen tools to medical instruments.

　　We wanted to build some kind of micro-scrubber that can clean without bleach and detergents,and can get into the crevices and the cracks. And so what we did, what we found is the bubble.

　　Normally, bubbles of gas contained in ordinary water have smooth surfaces. But the infusionof ultrasound makes their surfaces ripple, almost like the surface of sand paper. Flowing withwater over contaminated surfaces the bubbles effectively take dirt away.

　　One of the key factors of Starstream is that it takes any liquid that you are using and makes itseveral thousand times more effective. So if you are using soapy water or bleach, somethinglike that, it will make it more effective.

　　Starstream is especially effective for removing bacteria where it hides, like in this piece of glasssmeared with lipstick and mascara, or for cleaning rust spots from kitchen sinks.

　　Researchers say their invention could easily replace the recommended 20-seconds washing ofhands with soap and warm water, with only a six-second wash with water infused withultrasound.

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