Question:

What is this video trying to show?

Answer:

NO WEIGHT, NO PRESSURE.

In order for the water to be pressurised, something must be causing the water molecules to be squashed closer than they would have preferred so that they repel one another. That something is (usually) the gravitational pull. In other words, the origin of hydrostatic pressure is the gravitational pull on the fluid.

When the cup is dropped, the water in the cup is free falling. Being weightless, the water molecules in the cup stop pushing against one another (and the walls of the cup). Macroscopically speaking, the water pressure immediately disappears. Without the hydrostatic pressure, water stops being squirted out of the cup.

Delving Deeper

Likewise, hydrostatic pressure does not exist in outer space, or at the International Space Station (ISS). In fact, water hovers in the air as water balls in zero-g conditions. (Click here for proof)

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