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Since He is much less dense that air (He has only 14% of the density of air) the drag and flutter of the platters in the drives is reduced.
FORBES: Rare Gases and Fine Lines
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Water has (roughly) 800 times the density of air.
FORBES: Cruising Altitude: Minus 400 Feet
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The density of water molecules within the leaf is typically 60 times greater than the density of carbon dioxide in the air, and the diffusion rate of the water molecule is greater than that of the carbon-dioxide molecule.
WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide
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The density of helium is one-seventh that of air, delivering significant advantages to HGST's sealed-drive platform.
ENGADGET: HGST develops helium-filled, high-capacity hard drives: no, they won't float away
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The batteries themselves make use of the same zinc air technology used in hearing aid batteries, and apparently have the highest energy density of any portable consumer power solution, which translates to about three times the runtime of a similarly sized alkaline or lithium ion battery.
ENGADGET: Energizer introduces thin, powerful Zinc Air Prismatic battery
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During the dive, which takes up to four hours due to the high density of the water (it is filled with certain chemicals plus air pressure to simulate the circumstances found in space), the cosmonauts in training practice space walking -- and may lose a few kilos off their waist line in the strenuous process.
BBC: The dated future of Russia��s Star City
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We have low population density, clean air, fresh water, fertile land, an ocean on either side and a grand total of two nations on our borders. (One of which is a also a huge, stable and peaceful nation with clean air, fresh water, and fertile land and even lower population density).
FORBES: Crossroads for the Sole Superpower
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Birds were given different colors, squawks and abilities such as extra density, acceleration and the power to lay explosive eggs in the air before winging off their parabolas from the counterforce of laying eggs.
FORBES: Audacious Birds