NAC445B.030. “British thermal units” defined.

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“British thermal units (Btu)” means that quantity of heat required to raise the temperature of one pound of water from 60 degrees Fahrenheit to 61 degrees Fahrenheit at a constant, absolute pressure of 14.7 pounds per square inch (29.92 inches of mercury).

[Environmental Comm’n, Air Quality Reg. § 1.9, eff. 11-7-75; A and renumbered as § 1.21, 12-4-76]—(NAC A 10-22-87)—(Substituted in revision for NAC 445.457)

                    
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