The tiny molecules that accumulate and stick together on the top of water make a force called surface tension. This force also creates bubbles. Adding dish soap causes the water to become flexible so it can hold the shape of a bubble when air is blown into it. To prove this, put a short glass of water in the center of a pie plate. Fill another glass with water and slowly pour it into the first glass until the water reaches the rim but does not spill over, forming a dome. Stick your finger into this dome and watch what happens. Repeat with a small drop of dish soap on the tip of your finger. Compare the results.
All the colors of the rainbow are in a bubble; they just may not be visible at all times. Create an observatory to see every color and how light affects your view. Place a small, clear plastic lid from a margarine or yogurt container on a table with the rim down. Set a flashlight down on the center of the lid so the light can shine through it. Use clear, plastic tape to attach the lid to the flashlight. Holding the base of the flashlight, flip it upright so the lid is on top, like a dish. Dip a finger into the bubble solution and rub a thin layer across the lid to wet it. Put one spoonful of solution in the center of the lid, creating a pool of solution. Place a straw into the pool of solution and blow a bubble big enough to cover the lid. Turn the lights off, hold the flashlight above your head and look up through the clear lid to view the different colors, watching them change as the bubble pops.
Bubbles are flexible and can be made into many different sizes and shapes. To see this, try building a bubble castle. Spread bubble solution all over a cookie sheet or plate until it pools up and forms a thick layer. Dip one end of a straw into the bubble solution, and blow through the other end to create bubbles all over the surface. Create enough bubbles that they merge together and pile up on each other, creating stacks or bubble castles. Make bubbles inside of other bubbles by inserting the straw into one bubble and blowing air into it. Watch the bubbles change size as more air is blown into them and they connect and merge with other bubbles.
Increasing temperatures cause molecules inside bubble liquid to move faster, which causes the solution to thin and pop a bubble. Prove this by pouring the same amount of bubble solution into three identical, clear jars with lids. Use enough solution to completely wet the inside of each jar and still have a pool of liquid at the bottom. Shake the jars to move the solution around to completely wet the inside. Bubbles will form as you do this. Secure the lids on each jar. Put one in the freezer, leave one out at room temperature and submerge one in a bowl of hot water. After 30 minutes, shake each jar for 30 seconds each. Pay attention to how long it takes for the bubbles inside to pop.