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Hydrogen and helium are the most commonly used lift gases. Although helium is twice as heavy as (diatomic) hydrogen, they are both significantly lighter than air. Thus helium is almost twice as dense as hydrogen. The lifting power in air of hydrogen and helium can be calculated using the theory of buoyancy.
Prior to this decision, roughly two billion cubic feet of helium were separated from natural gas annually and 0.6 billion cubic feet were sold. Three years after the decision, 0.88 billion cubic feet were sold, 0.54 were stored, and 0.98 were separated and vented. At the same time, roughly 4.74 billion cubic feet were not separated from natural ...
In gaseous form, small quantities of helium are supplied in high-pressure cylinders holding as much as 8 m 3 (approximately . 282 standard cubic feet), while large quantities of high-pressure gas are supplied in tube trailers, which have capacities of as much as 4,860 m 3 (approx. 172,000 standard cubic feet).
Thus, bags of potting soil, or garden soil, are intended for in-ground use. Meet The Expert. Justin Hancock is a horticulturalist with Costa Farms. Potting mix is not the same thing as soil.
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In August 2014, the Bureau of Land Management auctioned crude helium from the national reserve at an average price of US$104 per thousand cubic feet of helium content. [29] Grade A helium sold for about $200 per thousand cubic feet, or $7.21 per cubic meter in 2014.
A soil test may be done to analyze the chemistry of a potting mix, despite the mix not necessarily being made of soil. As an approximation for indoor home planting, the mix is generally treated as greenhouse growth medium. The main method is a saturated media extract (SME), which tests the chemical contents of a water extract of the mix.