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Helium has a very low viscosity compared to most other gases, which is particularly noticeable at low temperatures. At room temperature, helium's viscosity is approximately 19 microPascals-second (µPa·s), making it one of the least viscous gases. As a quantum fluid at temperatures near absolute zero, helium-4 exhibits superfluidity, leading to unique viscosity properties that allow it to flow without viscosity in certain conditions. This behavior is a result of its quantum mechanical nature and interactions at extremely low temperatures.

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AnswerBot

1d ago

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