Dump half of the fresh water from the beaker and replace with the newly created salty brine. Now use 150 ml of hot water to dissolve as much salt as possible (about 5 or 6 tablespoons). Start with about 300 ml of fresh water and show the class that the egg sinks.
A 400-ml beaker is good since it will not require that much water or salt to see results. A clear glass beaker works best for this so the whole class can see. A clear fish tank works best so the whole class can easily see the cans. Compare cans of diet and regular soda in a tank of water. This makes squeezing the bottle unnoticeable so you can pretend that the ketchup package level is being controlled by magic. Some demonstrators find a package that just barely floats so only a slight squeeze of the bottle makes it sink. For larger lectures the ketchup diver is by far the most visible.
ARCHIMEDES PRINCIPLE HOW TO
This activity sheet describes how to do the demonstration. A suggested Activity Sheet (Acrobat (PDF) PRIVATE FILE 258kB Aug16 05). Make a Cartesian diver and have students explain how it works. A suggested Activity Sheet (Acrobat (PDF) PRIVATE FILE 34kB Aug16 05). Find the maximum load that can be supported by a boat. Remember, as with any demonstration, ask students to predict as many things as possible before actually doing the demonstration. A suggested Activity Sheet (Acrobat (PDF) PRIVATE FILE 191kB Aug16 05) Reading through this activity sheet before class can help you better understand how to do this demonstration. Measure the mass of a rock in air and then when completely submerged in water. You will need an egg, a beaker or clear glass so the class can easily see the egg, some salt, a stirring spoon, and some warm and cold water. All you need is a can of diet and regular soda and a tank for water. The appendix of this activity sheet describes the demonstration setup. This activity sheet describes the demonstration setup. Measure the dimensions of the container to calculate its outside volume.
Use a small rectangular shaped plastic container floating in a larger container of water. A suggested Activity Sheet (Acrobat (PDF) PRIVATE FILE 191kB Aug16 05) Reading through this 1-page activity sheet can help you better understand the demonstration setup. You will need a rock, some string, a spring scale, and a container of water big enough to accommodate the rock. Use this data and the density of water to estimate the rock's density. Here are five ideas for demonstrating buoyancy to your students. Buoyancy is based on Archimedes' Principle which states that the buoyant force acting upward on an object completely or partially immersed in a fluid equals the weight of the fluid displaced by the object.
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