Snow Storm In A Jar

[youtube=https://m.youtube.com/watch?v=CYG9_0-zw28]

What is happening?

Because oil is less dense than water, the water will naturally sink to the bottom of the jar.

The Alka-Seltzer tablet is denser than the oil or water, so it sinks to the bottom of the jar.

The sodium bicarbonate in the Alka-Seltzer produces carbon dioxide gas when it interacts with the water. Because the gas is less dense than water, it rises.

The oil pushes the gas bubbles back down. The back and forth pressure is what creates the snowstorm.