# Useful Constants

## Ideal Gas

• R = 8314.34 m3`·`Pa/kg-mol`·`K

• R = 8314.34 J/kg-mol`·`K

• R = 8314.34 kg`·`m2/s2`·`kg-mol`·`K

• R = 8.31434 J/g-mol`·`K

• R = 0.082057 m3`·`atm/kg-mol`·`K

• R = 1.9872 btu/lb-mol`·`°R

• R = 1545.3 ft`·`lbf /lb-mol`·`°R

• R = 0.7302 ft3`·`atm/lb-mol`·`°R

• R = 10.731 ft3`·`lbf /in2`·`lb-mol`·`°R

• R = 1.9872 cal/g-mol`·`K

• R = 82.057 cm3`·`atm/g-mol`·`K

## Stefan-Boltzmann

• σ = 5.676 × 10−8 W/m2`·`K4

• σ = 1.714 × 10−9 btu/h`·`ft2`·`°R4

# Useful Conversion Factors

## Temperature

• K = °C + 273.15

• °R = °F + 459.67

• °F = 1.8 × °C + 32

• °C = (5/9) × (°F − 32)

• Δ °F = 1.8 × Δ °C

• Δ °C = (5/9) × Δ °F

## Mass

• 1 kg = 1000 g = 2.2046 lbm

• 1 metric ton = 1000 kg

• 1 lbm = 453.59 g = 0.45359 kg

• 1 short ton = 2000 lbm

• 1 long ton = 2240 lbm

## Length

• 1 m = 3.2808 ft = 100 cm = 39.37 in

• 1 μm = 1 micron = 10−6 m = 10−3 mm = 10−4 cm

• 1 Å = ...

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