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Effect of pressure on viscosity?
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Saurabh 1 Best Answer
Actually Pressure has an effect on both, the viscosity of liquid as well as gases(not always in case of gases because viscosity of gases is usually temperature dependent not pressure dependent upto that extent). On increasing the pressure, viscosity of liquid molecules increases due to the increase in the resistance to the flow. While in case of gases as the pressure increases the intermolecular distance decreases; consequently, the intermolecular force increases. As a result, the relative velocity between two adjacent layers decreases, hence the coefficient of viscosity increases. For ideal gases, viscosity depends only on temperature(only function of temperature not of pressure).