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The punch indentation test was used to measure the static shear modulus (μ) of shaving foam. Surface tension of the foaming liquid, the mean foam cell diameter, and the volume fraction of the dispersed phase (φ) were measured to determine the overpressure (ΔP) in foam cells. It was found that with increasing foam age μ decreased, reaching a steady value of ∼0.18ΔPwhen φ ∼ 0.94. This is lower than...