The low Q structure factors have been determined in the region down to Q = 0.08A-1 for liquid Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Al and In at several temperatures by x-ray diffraction with the transmission mode. The low- Q structure factor is a slowly increasing function of Q, and its profile is quite similar among the liquid metals presently investigated. The long wavelength limit value of S(Q) derived from the present experimental structural data agrees well with that calculated from the isothermal compressibility for seven metals near the melting point. A difference larger than 10% was found in the cases of liquid Cs, Ca and Al.
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