AbstractDetermination of thermophysical properties of transparent fluids by laser spectroscopy.This review deals with the determination of thermophysical properties of transparent fluids by laser‐spectrometric methods. On the basis of the phenomena of laser‐Rayleigh and laser‐Brillouin scattering the paper demonstrates that the transfer coefficients thermal conductivity, diffusion coefficient, and viscosity, as well as the velocity of sound, sound attenuation, specific heats, and compressibility are fundamentally derivable at thermodynamic equilibrium over a wide range of temperature and pressure. Typical measurements show that the methods used for measuring some of the quantities have already reached standards maturity while others are still in their initial s