Liquid Helium at `2.2K` and at 1 atm pressure flows in the upward direction. It is because of its low

Liquid Helium at `2.2K` and at 1 atm pressure flows in the upward direction. It is because of its low
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Liquid Helium at `2.2K` and at 1 atm pressure flows in the upward direction. It is because ... . heat of vapourisation C. viscosity D. surface tension
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