The results provided by our saturated water and steam calculator and table are highly accurate, as they are based on the NIST Steam Tables. The NIST Steam Tables are a widely accepted standard reference for the thermodynamic properties of water and steam, and they have been extensively validated through experimental measurements and theoretical calculations. Our calculator and table use these validated values to provide accurate results for specific volume, enthalpy, entropy, and other thermodynamic properties over a range of temperatures and pressures.