The property of flowing very quickly in a liquid is called low viscosity.

Here's a breakdown:

* Viscosity: Viscosity is the resistance of a fluid to flow. Think of it as the "thickness" of a fluid.

* Low viscosity: Liquids with low viscosity flow easily and quickly. Examples include water, gasoline, and alcohol.

* High viscosity: Liquids with high viscosity flow slowly and with resistance. Examples include honey, syrup, and motor oil.

So, a liquid that flows very quickly has a low viscosity, meaning it doesn't resist flow very much.