Lattice parameters, thermal expansion coefficients, and Gru¨neisen parameters of tungsten are determined by an x‐ray method in the temperature range of 180–40 K without the use of liquid gases. Lattice parameters are expressed as a function of temperature. Thermal‐expansion coefficients decrease with temperature and show no anomaly in contrast to a hypothesis proposed by Featherston and Neighbours. Gru¨neisen parameters &ggr; are decreasing with temperature in accordance with the theoretical predictions.