Energy/unit mass

1 Btu/lbm = 2.326 kJ/kg

1 kJ/kg = 0.4299 Btu/lbm

Heat/unit area

1 Btu/hr·ft² = 3.154 W/m²

1 W/m² = 0.317 Btu/hr·ft²

Heat/unit length

1 Btu/hr·ft = 0.9613 W/m

1 W/m = 1.0403 Btu/hr·ft

Thermal Conductivity (k)

1 Btu/hr·ft·°F = 1.7307 W/m.°C

1 W/m·°C = 0.5778 Btu/hr·ft·°F

Convection Heat Transfer Coefficient (h)

1 Btu/hr·ft²?°F = 5.6783 W/m^2·°C

1 W/m²·°C = 0.1761 Btu/hr·ft^2·°F

Specific Heat (Cp)

1 Btu/lbm?°F = 4.1869 kJ/kg·°C

1 kJ/k·°C = 0.23884 Btu/lbm·°F

Dynamic Viscosity (µ)

1 kg/m·s = 0.672 lbm/ft·s = 2419.2 lbm/ft·hr

1 lbm/ft·s = 1.4881 kg/m·s

Kinematic Viscosity and Thermal Diffusivity

1 ft²/s = 0.092903 m²/s

1 m²/s = 10.7639 ft²/s

Temperature (delta T)

°R = 1.8 °K OR °F = 1.8 °C

°K = 0.556 °R OR °C = 0.556 °F

Temperature (T)

T (°F) = 1.8 * T (°C) + 32

°K = 0.556 °R OR °C = 0.556 °F

Temperature (T)

T (°R) = T (°F) + 459.67

T (°K) = T (°C) + 273.15

Stefan-Boltzmann constant

0.1714E8 Btu/hr·ft^2·°R⁴

5.669 E8 W/m^2·°K⁴

Thermal Expansion

1 µin/in ?°F = 1.8E-6/K

1/K = 5.556E5 µin/in ·°F

Thermal Resistance Coefficient

1 clo = 0.15482 m²K/W

1 m²K/W = 6.459 clo