Science Tips

Floatation

There's an old saying that if you are standing in a boat in the middle of a lake and dropped a cannonball into the water, the water level of the lake would actually drop? This seems contradictory to common sense because as we all know, when you drop an object into a body of water the water level rises because of the volume of water that the object displaces. But guess what?  This old saying is really true.  Read For example, if you fill your bathtub with water all the way to the brim and then climb into the tub, the water will spill over the edge of the tub. This happens because of the large amount of water that your body displaces when you…
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Floatation

The homemade pen cap sinker

Make a pen cap sinker to demonstrate Pascal’s law Fill the plastic bottle with water. Attach a piece of clay to the arm of a plastic pen cap. Put the cap in the bottle so that it floats. Put the lid on the bottle and tighten so that it does not leak any air. Squeeze the sides of the bottle. What do you think causes the pen cap to sink when you squeeze the sides of the bottle? By squeezing the bottle, you increase the pressure inside, thus forcing more water up into the pen cap. The added water in the cap increases its weight and causes the cap to sink. A submarine works along these same principles. If the average density of the submarine…
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Floatation

Principles of Flotation science experiment

What makes a heavy ship float? How does a boat or ship carrying hundreds of pounds worth of stuff float while that same stuff would sink to the bottom of the ocean if dumped overboard? How come when you're in a pool and you stretch your body out flat you float. But, if you wrap your arms around your legs and curl up into a ball you sink? Well, it all has to do with how much water is pushing against you and a little scientific principle called buoyancy or floatation. When you stretch out flat more water pushes against you since your body is laid out flatter. When you curl up into a ball, less water is pushing against you. Want to test this…
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Cohesion

The ‘Am I Dense’ experiment

The 'Am I Dense' experiment In our floating experiment, we touched on the topics of buoyancy. But in reality, flotation is also affected by other scientific principles as well. Here, let Reeko Pour one-third cup of syrup into the glass jar. Now pour one-third cup of cooking oil into the jar. Finally, pour one-third cup of water into the jar. Let the contents settle for a few minutes. Drop a piece of plastic, a grape, and a small cork into the liquid. Notice how the objects you dropped in settle down to different layers of the mixture. The liquids have different densities. The most dense (syrup) will be at the bottom, the least dense (oil) will be at the top, with the water in between.…
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