ESDU 95018 gives the variation of thermal conductivity for seventy-three liquid aliphatic ethers from the normal melting point to 0.9 critical temperature at 10 K intervals. The data were obtained by fitting a polynomial equation to experimental data from a wide range of sources for each compound; the constants of the equation were also faired with molecular structure for compounds that were members of the same chemical series. The normal melting points and critical temperatures are also given@ and an equation for predicting the effect of pressure on thermal conductivity for pressures up to 500 atmospheres is suggested. A full bibliography is given of the sources consulted.