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Not Available Accurately gauging liquid quantity in tanks in low and zero gravity proves difficult because surface tension forces migrate vapor roughly to tank center and away from any solid probes. Small accelerations also cause slosh states which frustrate static measurements. Gauging systems on spacecraft must also handle cryogens accurately (and not, for example, add any significant heat to cryotanks). Foster-Miller proposes to combine its patented Dynamical Instruments nonlinear analysis with an acoustic or radio frequency resonant mode sensor. Existing efforts have correlated liquid volume roughly with resonant frequency. Unfortunately, slosh states and varying vapor-liquid orientations prevent conventional linear signal analysis from attaining useful accuracies. We propose to use Foster-Miller's dynamic nonlinear signal analysis methods to extract liquid quantity accurately (at least within