December 3, 2010
by: Ron Perkins
At first glance No-Pop Bubbles may seem like any other bubbles. While the bubble solution is a bit more viscous, one blows No-Pop Bubbles like any other bubble. The small bubble wand suspends a bubble film which, when air is blown through it, releases small bubbles into the air. These bubbles, however, are no ordinary bubbles. No-Pop Bubble solution begins as a regular soap and water bubble solution. Added to this solution is a small amount of a non-toxic water soluble polymer. When No-Pop Bubbles are first blown, the bubbles behave like ordinary bubbles. As the water evaporates from the bubble’s surface, however, an extremely thin plastic ‘bubble skeleton’ remains. It is this plastic bubble skeleton which has the properties for which No-Pop Bubbles are named.
Blow No-Pop Bubbles up into the air. Observe the colors (interference patterns) in the bubbles as they float. In approximately 10 seconds (depending on the relative humidity) the colors in the bubbles will begin to disappear. When the bubble are colorless, they may be caught on your finger without popping! Read the rest of this entry »
November 12, 2010
by: Michelle Bertke and Melanie Bunda
Bubbles are always a fun and interesting activity for kids of all ages. However, bubbles are not only fun, they are also an excellent teaching tool for some abstract concepts such as air density, dissolved gasses, and air pressure. Below is a collection of bubbly activities that highlight each of these topics. Educational Innovations offers a full line of wonderful bubble products!
Gravity Defying Bubbles
Different gasses have different densities. The air around us is mostly nitrogen (N2) and oxygen (O2), which are both lighter than carbon dioxide (CO2). When a heavy gas, such as CO2 is placed in a tank, it will sink to the bottom without mixing. This can be achieved by placing a few blocks of dry ice in a large fish tank or clear plastic bin covered loosely with a lid and allowing them to sublime. This will take several minutes. Always use caution when handling dry ice by using proper gloves and safety goggles. Once full, blow bubbles over the surface of the tank. When the bubbles reach the interface of the two gasses, they will float. If you fill the tank with CO2 unnoticed, have the kids speculate as to why they think the bubbles didn’t reach the bottom, and what might be in the tank. An alternative is to fill a balloon with CO2 by filling it with baking soda (or an alka seltzer tablet) and placing it over the opening of a bottle filled with vinegar (or water). Lift the balloon so the contents spill into the bottle and react with the liquid, allow the balloon to fill from the reaction, twist and remove. Use it to blow bubbles. Compare these bubbles to those blown with regular air (use a fan, not your breath for best results). Have students compare the two bubbles. Which one falls faster? Which one floats longer? Read the rest of this entry »