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A new type of viscometer based on the Poiseuille flow principle has been developed that is capable of measuring solution viscosities at ultrahigh pressures. The capillary time-of-flight (CTOF) viscometer has been used to measure the viscosity of methanol–water and acetonitrile–water mixtures in decade volume% increments from atmospheric pressure to 3500bar (50,000psi), at 25°C. This instrument works...
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