Experiment: Controlling 'flowing' smoke like water

Smoke is a gas, which tends to fly upward and disperse because they are lighter than air. Leaving the smoke straight down, it needs to be thicker than air.

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John Holland and Jarvis Harris, two researchers at Harvard University, found a way to control smoke, making them actually flow down like a still water by keeping smoke molecules in the tube, they will be cold and denser.

See the smoke flowing like a waterfall in the following video:

The experiment shows that we can completely control, control and adjust the smoke to make them a "peaceful" stream.