what does it do?if you have a floating cup with a hole and you add oil on top of the water in it, with free flow, will it sink, float, or no change?
A floating cup with a hole with sink with or without oil.
Just remember how hydrostatic pressure works. Because of the hole and added oil weight causing extra pressure, water flows outside so that pressure increases simply as function of depth.
>>17005716Generally yes – however, won't it float mid-sink if it meets a level where the cup density matches water density?
>>17005719No. If the material of the cup wall itself has exactly the same density as the water, it will do many things, but floating partially below the water is not one of those things. For that the cup needs to be closed at the bottom.
>>17005719If you drop a circular disc in water and it sinks and then stops as it meets a level where its density is equal to water density there... what is the difference if the disc has a hole in the center?
>>17005716it is made of cork
>>17005720Tagged myself accidentally. But my point is hydrostatic pressure is what matters.
>>17005724If it's made of cork, it'll just float to the very top and hold no liquid. The density of cork is way too low.
>>17005713If the dimensions were exaggerated it would be somewhere between B and C. Oil column could reach slightly higher in proportion to the density difference between it an water.
>>17005840>>17005713Also the floating cup is totally unnecessary for the experiment, you can try this at home with something like a deep drinking glass and any small see trough container like a party/glass straw or rolled up piece of plastic sealed with tape or something of that nature. Just tape that into the side of the glass so the bottom is free and then fill with water and then start filling the straw with oil. For best effect pick the lightest oil (or any other fluid, even better if you got gasoline available) and heaviest base fluid (mix in some salt for instance).
