One exception to note: If the food's sitting in an environment where the temperature is over 90Â°F, the USDA says the food should only be left out for one hour, so keep an eye on the clock if you're serving food on a hot day!
Estimated cost of hydrogen per kilogram in a variety of scenarios. With all of this in mind, here are the cost estimates per kilogram (which each include $1.25 for taxes): Hydrogen from natural gas (produced via steam reforming at fueling station). $4 â $5 per kilogram of hydrogen.
using values from the tables calculate the fuel cost of producing steam steam cost $ 8 00 mmbtu 10 6 btu mmbtu x 1000 lbx 1006 btu lb 0 857 $ 9 39 1000 lb effective cost of steam the effective cost of steam depends on the path it follows from the boiler to the point of useteam cost $ 8 00 mmbtu 10 6 btu mmbtu x 1000 lbx 1006 btu lb 0 857 $ 9 39 1000 lb effective cost of steam the effective cost of steam depends on the path it follows from the boiler to the point of use