Demonstrations

=Demonstrations= Chapter 3 Fluids and Pressure It seems year after year when we discuss pressure as a class a student allows brings up something about the guy you see laying on a bed of nails. I thought the best way to explain this concept to them would be to show them. Besides everybody knows what would happen when the tip of a nail would touch a ballon, right? So I inflated a balloon, placed it on a bed of nails, and began adding masses in one kilogram (2.204lbs) increments to the top board.
 * Pressure**

So by my calculations that is 17 kilograms on top of that balloon, that is 37.47 pounds pushing that balloon down onto nails!!!! I hope they understand now how that guy lays on a bed of nails. I bet if that guy took every other nail out of the board, they would get the point!

Ever go to a picnic and reach inside the cooler when the ice is all melted? Seems all the Coke cans have sunk to the bottom and all the diet Coke cans are floating at the surface. Is this just a coincidence? Nope it makes perfect sense. Since Coke has 39 grams of sugar in it and diet Coke has 0 grams of sugar it, it is less dense then the Coke, therefore it is going to float to the surface instead of sinking like the Coke. The same concept applies to other liquids such as, rubbing alcohol, crisco oil, water, and saltwater. Because they all have different densities it is very easy to stack them on top of each other in a cylinder with nothing separating them.
 * Density**