Science Mom's Guide to Water, Part 5 - Water and Oil скачать в хорошем качестве

Science Mom's Guide to Water, Part 5 - Water and Oil

Join Science Mom to explore why oil and water don't mix with four investigations: ocean in a bottle, lava lamp, oil lamp, and a grease fire explosion. You can download the foldable book that goes along with this video here: https://science.mom/science-mom-s-gui... Below are some notes and links about the various investigations: OCEAN IN A BOTTLE: To make the boats for "Ocean in a bottle" I used a small amoung of hot glue to attach a short piece of a toothpick to the inside of a plastic bead (The beads I used are commonly called "pony beads"). Then I used the label I'd taken off the water bottle to make the flag (one side was sticky, so I just folded it in half over the toothpick and cut it into a triange shape.) Tinfoil or cellophane or a thin piece of plastic will also work for the sail, but you'll need to use more glue. LAVA LAMP: If you don't have effervescent antacid tablets, you can do a variation using baking soda and vinegar. Add a small amount of vinegar to the water and then pack some baking soda into a paper towel "pellet" (Wrap the soda with the paper towel and twist off the ends do it doesn't spill out.) You have to pack them quite firm and there's more troubleshooting involved with this method, but it's a viable workaround. OIL LAMP: Oil lamps have been around for thousands of years. The wikipedia article on oil lamps has a nice sketch of the history and variety of some of these lamps. (https://en.wikipedia.org/wiki/Oil_lamp). The fuel and wick have been whatever people had on hand - from melted butter and cotton to kerosene and wood, or (in this video), soybean oil and toilet paper. GREASE FIRE EXPLOSION: When you heat oil, it doesn't boil like water does. First, it smokes. When the oil starts to smoke, you should take that a sign to turn down the temperature. Most oils smoke at 450 degrees F or 230 degrees C (or higher). If you keep heating an oil after it starts smoking, the temperature can increase to the "flash point." At this temperature, the oil can spontaneously catch fire. And once you have a grease fire, you need to be very careful how you put it out, because the oil (and the fire) can spread dramatically if you take the wrong appraoch. "Auto-Ignition of Cooking Oils" is a good paper from the University of Maryland I referenced when working on this video. It can be found here: http://drum.lib.umd.edu/bitstream/han... This cooking lore post is also a good source of information about grease fires: http://www.culinarylore.com/food-scie... ... This video was made using iMovie and the music is from the iMovie library (Elysium Long, Pendulum, Watercolor Medium, East Ender Long, Investigation Long, and Curtain Call Medium). All images were drawn by me.