Ideal Gas Constants (R) for air: In US Customary units

**Specific Gas Constant for Dry Air (R_air) — Imperial Unit Variants**
Length	Force	Mass	Temp	R_air (value)	Units
ft	lbf	lbm	°R	53.35	ft·lbf/(lbm·°R)
ft	lbf	slug	°R	1716	ft·lbf/(slug·°R)
ft	poundal	lbm	°R	1.657	ft·poundal/(lbm·°R)
ft	poundal	slug	°R	5.52×10⁴	ft·poundal/(slug·°R)
ft	kipf	lbm	°R	0.05335	ft·kipf/(lbm·°R)
ft	kipf	slug	°R	1.716	ft·kipf/(slug·°R)
yd	lbf	lbm	°R	160.05	yd·lbf/(lbm·°R)
yd	lbf	slug	°R	5148	yd·lbf/(slug·°R)
yd	poundal	lbm	°R	51.45	yd·poundal/(lbm·°R)
yd	poundal	slug	°R	1.74×10⁶	yd·poundal/(slug·°R)
yd	kipf	lbm	°R	0.1601	yd·kipf/(lbm·°R)
yd	kipf	slug	°R	5.148	yd·kipf/(slug·°R)
in	lbf	lbm	°R	4.446	in·lbf/(lbm·°R)
in	lbf	slug	°R	142.3	in·lbf/(slug·°R)
in	kipf	lbm	°R	0.004446	in·kipf/(lbm·°R)
in	kipf	slug	°R	0.143	in·kipf/(slug·°R)
in	poundal	lbm	°R	0.138	in·poundal/(lbm·°R)
in	poundal	slug	°R	4.44	in·poundal/(slug·°R)
Conversions: 1 ft = 12 in · 1 yd = 3 ft · 1 slug = 32.174 lbm · 1 lbf = 32.174 poundal · 1 kipf = 1000 lbf Always use absolute T: T(°R) = T(°F) + 459.67

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