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# Temperature °C = 5/9 (°F - 32) - after subtracting 32 °F = (9/5 °C) + 32 - then add 32 K = °C + 273.15 °C = K - 273.15 °K = -459.67°F # Energy (derived) SI unit: Joule (J) 1J = 1 kg⋅m²/s² 1J = 0.23901 cal 1cal = 10⁻⁷ erg = 1C × 1V 1cal = 4.186J 1eV = 1.602 × 10⁻¹⁹ J 1 kWh...

# Temperature °C = 5/9 (°F - 32) - after subtracting 32 °F = (9/5 °C) + 32 - then add 32 K = °C + 273.15 °C = K - 273.15 °K = -459.67°F # Energy (derived) SI unit: Joule (J) 1J = 1 kg⋅m²/s² 1J = 0.23901 cal 1cal = 10⁻⁷ erg = 1C × 1V 1cal = 4.186J 1eV = 1.602 × 10⁻¹⁹ J 1 kWh = 3.60 × 10⁶ J 1 ft⋅lb = 1.356 J 1 Btu = 1055 J = 252 cal = 77 ft⋅lb # Pressure (derived) SI unit: Pascal (Pa) 1 Pa = 1 N/m² 1 Pa = 1 kg/m⋅s² = 1.451 × 10⁻⁴ psi 1 atm = 101,325 Pa = 1.013 × 10⁵ Pa 1 bar = 10⁵ Pa or 1 × 10⁵ Pa = 0.9869 atm = 760 mmHg = 14.7 psi = 101.325 kPa 1 torr = 1 mmHg = 133 N/m² 1 lb/in² = 6895 Pa 1 lb/ft² = 47.88 Pa 1 atm = 760 torr = 2117 lb/ft² = 14.70 lb/in² # Time SI unit: Second (sec) 1 min = 60 sec 1 hr = 60 min = 3600 sec 1 mean solar day = 24 hrs = 86,400 s 1 wk = 7 days; 1 yr = 365.25 days 1 decade = 10 yrs 1 century = 100 yrs # Power 1 W = 1 J/s 1 hp = 746 W = 550 ft⋅lb/s 1 Btu/h = 0.293 W # Force 1 N = 10⁵ dyne = 0.2248 lb 1 lb = 4.448 N = 4.448 × 10⁵ dyne # Angle 1 rad = 57.30° = 180°/π 1° = 0.01745 rad = π/180 rad 1 revolution = 360° = 2π rad 1 rev/min (rpm) = 0.1047 rad/s # Speed 1 m/s = 3.281 ft/s 1 ft/s = 0.3048 m/s 1 mi/min = 60 mi/h = 88 ft/s 1 km/h = 0.2778 m/s = 0.6214 mi/h 1 mi/h = 1.466 ft/s = 0.4770 m/s 1 furlong/fortnight = 1.622 × 10⁻⁴ m/s # Acceleration 1 m/s² = 100 cm/s² = 3.281 ft/s² 1 cm/s² = 0.01 m/s² = 0.03281 ft/s² 1 ft/s² = 0.348 m/s² = 30.48 cm/s² 1 mi/hr² = 1.467 ft/s²