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    The viscosity of a fluid is affected by temperature; a rise in temperature increases the occurrence of intermolecular collisions which in turn decreases viscosity (i.e. its fluidity increases)

    As terminal velocity increases, the coefficient of viscosity decreases.

    Are the above statement correct?
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    (Original post by GPODT)
    Are the above statement correct?
    True: viscosity of a fluid is affected by temperature
    True: rise in temperature increases the rate of intermolecular collisions

    Not true: The increase in intermolecular collisions decreases viscosity

    This is indirectly the reason for an increase in viscosity of gases. The decrease in the viscosity of liquids is not a direct result of an increase in intermolecular collisions, it's a result of the decrease in intermolecular forces.

    It would be more meaningful to say this the other way round.
    As viscosity decreases, terminal velocity increases. Which is cause and which is effect?
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    (Original post by Stonebridge)
    True: viscosity of a fluid is affected by temperature
    True: rise in temperature increases the rate of intermolecular collisions

    Not true: The increase in intermolecular collisions decreases viscosity

    This is indirectly the reason for an increase in viscosity of gases. The decrease in the viscosity of liquids is not a direct result of an increase in intermolecular collisions, it's a result of the decrease in intermolecular forces.

    It would be more meaningful to say this the other way round.
    As viscosity decreases, terminal velocity increases. Which is cause and which is effect?
    Thank you. !
 
 
 
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