Conversion Factors for Physical Measurements
Sooner or later, you’re going to have to convert from one unit of physical measurement to another. This list gives you some of the most common conversion factors you need in thermodynamics.

Acceleration: 1 m/s^{2} = 100 cm/s^{2}

Area: 1 m^{2} = 10^{4} cm^{2} = 10^{6} mm^{2}

Density: 1 g/cm^{3} = 1 kg/L = 1,000 kg/m^{3}

Energy, heat, work, internal energy, enthalpy: 1 kJ = 1,000 J = 1,000 N·m = 1 kPa·m^{3}
1 kJ/kg = 1,000 m^{2}/s^{2}

Force: 1 N = 1 kg·m/s^{2}

Length: 1 m = 100 cm = 1,000 mm

Mass: 1 kg = 1,000 g

Power, heat transfer rate: 1 W = 1 J/s, 1 kW = 1,000 W

Pressure: 1 Pa = 1 N/m^{2}, 1 kPa = 1,000 kPa, 1 MPa = 1,000 kPa
1 atmosphere (atm) = 101.325 kPa

Specific heat, entropy: 1 kJ/kg · °C = 1 kJ/kg · K = 1 J/g·°C

Specific volume: 1 m^{3}/kg = 1,000 L/kg = 1,000 cm^{3}/kg

Temperature: T(K) = T(°C) + 273.15, T(°C) = (5/9) T(°F) – 32, T(°F) = (9/5) T(°C) + 32

Velocity: 1m/s = 3.6 km/hr

Volume: 1 m^{3} = 1,000 L = 10^{6} cm^{3}