The basic physics and physics of water levitation is quite simple. When water is immersed in a liquid (glacial-type water) it becomes buoyant as the temperature increases from freezing to around 40°C (104°F). As water rises to the surface and the temperature decreases, water becomes colder than the surrounding liquid. The volume of liquid the water displaces decreases and the pressure increases.
This difference in pressure and volume causes the water to start floating in the sky. If a water drop is just the right size, it should fall to the bottom of the container when dropped. As the water drops into the container, it becomes a droplet (particle) and falls down the length of the container slowly but constantly. As the water droplets fall to the bottom of the container, they compress as they pass through the container. As the water droplets compress below the container, they increase as they decrease in temperature, and become larger, eventually reaching the bottom. The water will now start to lift in the container.
Now imagine doing that same thing with air. Air is an extremely viscous liquid. As the temperature increases from freezing to 50°C (122°F) the air becomes thicker still and will begin to float. The volume of air at the surface is less than the air inside the container. If you drop a drop of air into the container at room temperature (around 20°C (68°F)), the air can compress and float, but the air inside the container will only gradually lose volume (as air dissolves in the water).
Why do you need a container?
So you want to levitate a particle of water at a particular location. What you need is a container that can hold a drop of air. In most cases, the container will be a cup sized container such as a clear plastic milk jug. If you want to levitate a piece of plastic at the end of a rope, a rubber band or a rubber banded string, or if you want to levitate two pieces of plastic (a bag and a stick) at the same time, get yourself a container that is long enough to allow you to float the pieces with the end of the string attached to them, and that also provides enough room for the length needed for floating. And yes, there is a reason why I say that it’s important to make the container long enough.
The key is finding a container that can hold a drop of air. If you want a simple
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