  We calculate the lowest-dimensional nonlocal quark and gluon condensates
within the single instanton approximation of the instanton liquid model. As a
result, we determine the values of average virtualities of quarks $\lambda_q^2$
and gluons $\lambda_g^2$ in the QCD vacuum and obtain parameterless predictions
for the ratio $\lambda_g^2/\lambda_q^2 = 12/5$, and for some ratios of
different vacuum condensates of higher dimensions. The nonlocal properties of
quark and gluon condensates are analyzed, and insufficiency of the single
instanton approximation is discussed.
