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Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. ... Helium: 0.0001785: 0.008 (2. ... (1.62 × 10 19 kg) 1.84 ...
Therefore, the amount of mass that can be lifted by helium in air at sea level is: (1.292 - 0.178) kg/m 3 = 1.114 kg/m 3. and the buoyant force for one m 3 of helium in air at sea level is: 1 m 3 × 1.114 kg/m 3 × 9.8 N/kg= 10.9 N. Thus hydrogen's additional buoyancy compared to helium is: 11.8 / 10.9 ≈ 1.08, or approximately 8.0%
Helium: 0.3 × 0.1786 kg/m 3 = 0.05358 Nitrogen: 0.5 × 1.251 kg/m 3 = 0.6255 Mixture: 0.96488 kg/m 3. If this is to be used at 50 msw, absolute pressure can be taken as 6 bar, and density will be 6 × 0.96488 = 5.78 kg/m 3 This is less than the upper limit of 6.2 kg/m 3 recommended by Anthony and Mitchell, but more than their preferred limit ...
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In addition to physiological disadvantages, the use of trimix also has economic and logistic disadvantages. The price of helium increased by over 51% between the years 2000 and 2011. [11] This price increase affects open-circuit divers more than closed-circuit divers due to the larger volume of helium consumed on a typical trimix dive.
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Technically speaking, the recommended dietary allowance for protein is 0.8 grams per kilogram of body weight for adults 18 and older (roughly 0.36 grams of protein for every pound you weigh).
According to helium conservationists like Nobel laureate physicist Robert Coleman Richardson, writing in 2010, the free market price of helium has contributed to "wasteful" usage (e.g. for helium balloons). Prices in the 2000s had been lowered by the decision of the U.S. Congress to sell off the country's large helium stockpile by 2015. [23]