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Hydrogen, nitrogen, oxygen and chlorine are cheapest by volume at atmospheric pressure. When there is no public data on the element in its pure form, price of a compound is used, per mass of element contained. This implicitly puts the value of compounds' other constituents, and the cost of extraction of the element, at zero.
Liquid nitrogen (LN 2) is nitrogen in a liquid state at low temperature. Liquid nitrogen has a boiling point of about −196 °C (−321 °F; 77 K). It is produced industrially by fractional distillation of liquid air .
Energy per unit volume has the same physical units as pressure, ... or embodied energy (the energy output costs to provide, as ... Liquid nitrogen: 0.77 [90] 0.62 213.9
The energy density—derived from nitrogen's isobaric heat of vaporization and specific heat in gaseous state—that can theoretically be realised from liquid nitrogen at atmospheric pressure and 27 °C ambient temperature is about 213 watt-hours per kilogram (W·h/kg), while typically only 97 W·h/kg can be achieved under realistic circumstances.
For liquid nitrogen L, the heat of vaporisation is 200kJ/Kg; The boiling point of liquid nitrogen is 77Kelvin; The temperature of atmospheric air is ~ 300Kelvin; And this gives 570 kilojoules of energy per kg of Liquid nitrogen Lumos3 15:47, 18 July 2005 (UTC) Yep, and the energy density of gasoline is 45,000 kJ/kg.
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Over 265,000 gallons of the fertilizer flowed out of the storage tank due to human error, officials said.
The gaseous state of water is lighter than air (density 0.804 g/L at STP, average molecular mass 18.015 g/mol) due to water's low molar mass when compared with typical atmospheric gases such as nitrogen gas (N 2). It is non-flammable and much cheaper than helium. The concept of using steam for lifting is therefore already 200 years old.
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