Junior+Science+-+Bubbles+and+Light

how the swirling rainbows formed on the surface of the bubbles - here, explaining it to Charlie, using his diagram on the right. || || =Bubbles for Juniors - [|Click here]=
 * [[image:P1200207.JPG]]
 * Well done Nick!** Nick rose to the challenge of researching
 * [[image:P1200075-2.JPG width="316" height="235"]] || [[image:P1200079-2.JPG width="329" height="237"]] ||
 * [[image:P1200087-1.JPG]] || [[image:P1200100-2.JPG width="328" height="244"]] ||

= The Allen Centre's GIANT Bubble Recipe.... =
 * [[image:bubble2.jpg width="254" height="238"]] || = =


 * 1 cup sugar
 * 1 cup boiling water
 * 2 cups detergent (palmolive)


 * Dissolve the sugar in the boiling water.
 * Add the detergent. Stir well
 * Leave for 4 hours ||
 * [[image:bubbles_10.jpg width="255" height="194"]] || = No Wand? =

You can **[|make a bubble wand]** easily from 2 drinking straws.

Invent your own .... try twigs, cookie cutters, plastic lids pipe cleaners, wire coat hangers, fly swatters... even your hands! .
 * If you can wave your hand, you can blow bubbles. ** ||
 * [[image:bubbles6.jpg width="333" height="270"]]

Click [|here]to find out.
||

Click [|here]
|| ' This is a bit of chemistry. Soap molecules have two ends — one end likes to stick to water, and the other end is repelled by water.
 * [[image:bubble3.gif width="255" height="273" align="center"]] || ==First off, why does the soap bubble form at all?==

The bubbles you see when you wash your hands are caused by this property of the soap molecules. The soap molecules “surround” the water molecules, with the “water sticky” bits pointed towards the water, and the “water repellent” bits pointed away from the water.

This is what the surface of a soap bubble is — a thin layer of water sandwiched between the soap molecules. || || ==Reflect and Bounce and Interfere...== As light hits the bubble's **Soapy Layer Sandwich**...
 * [[image:bubble8.jpg width="299" height="212"]]
 * 1) some reflects off Soapy Layer (SL) 1
 * 2) some goes through SL 1 and bounces back from SL 2
 * 3) some bounces ONCE between SL1 and SL 2
 * 4) some bounces TWICE between SL1 and SL 2
 * 5) some bounces HEAPS OF TIMES between SL1 1 and SL 2

All this bouncing and reflecting **interferes** with the shape of the light waves and the angle from which we see them to form rainbows.

Even more interference...
...comes from the **curve** of the bubble, the **thickness** of its walls and the way gravity pulls the soapy sandwich downwards. ||
 * [[image:bubble10.gif width="335" height="226"]]

[|Antibubbles?]

 * and**

[|More]
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Heaps of Bubble Stuff [|here]
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