Given below are two statements:
Statement I: Viscosity of liquid decreases with an increase in temperature.
Statement II: The units of viscosity are kg m-1 s-2.
Given below are two statements:
Statement I: Viscosity of liquid decreases with an increase in temperature.
Statement II: The units of viscosity are kg m-1 s-2.
Show Hint
- Viscosity of liquids decreases with increasing temperature.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are not correct
- Statement I is correct, but Statement II is not correct
- Statement I is not correct, but Statement II is correct
The Correct Option is C
Solution and Explanation
Step 1: Understanding viscosity behavior
- Viscosity is a measure of a fluid’s resistance to flow.
- As temperature increases, the intermolecular forces weaken, decreasing viscosity.
- This applies to liquids, whereas for gases, viscosity increases with temperature due to molecular kinetic energy increase.
Step 2: Understanding viscosity units
- The SI unit of viscosity is the Pascal-second (Pa·s), which is equivalent to N·s/m2
- This can be written as: Pa·s = kg/m·s
- The given unit (kg m-1 s-2) is incorrect for viscosity but correct for pressure.
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