Which law describes the relationship between viscosity and temperature...
- Newton's Law of Viscosity is the correct answer.
- For gases, as temperature increases, viscosity generally increases because higher temperatures cause gas molecules to move faster and collide more frequently.
- This differs from liquids, where increasing temperature typically decreases viscosity.
- Newton's law provides a fundamental understanding of how fluid viscosity changes with temperature, particularly in gases.
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Which law describes the relationship between viscosity and temperature...
Understanding Viscosity and Temperature Relationship
Viscosity is a measure of a fluid's resistance to flow, and for gases, it is significantly influenced by temperature. The relationship between viscosity and temperature for gases is best described by Newton's Law of Viscosity.
Newton's Law of Viscosity
- Newton's Law states that the viscosity of a fluid is directly proportional to the shear stress and inversely proportional to the rate of shear strain.
- For gases, as temperature increases, the kinetic energy of gas molecules also increases, leading to more frequent and energetic collisions between molecules.
- This results in a decrease in viscosity with increasing temperature, allowing gases to flow more easily.
Characteristics of Viscosity in Gases
- Unlike liquids, where viscosity often decreases with temperature, gases exhibit a unique behavior:
- Viscosity increases with temperature.
- This is due to the increased molecular motion, which facilitates the transfer of momentum between layers of gas.
Comparison with Other Laws
- Boyle's Law: Relates pressure and volume at constant temperature; not applicable for viscosity.
- Gay-Lussac's Law: Deals with the relationship between pressure and temperature; again, not related to viscosity.
- Charles' Law: Focuses on the volume-temperature relationship; does not address viscosity.
In conclusion, for gases, the relationship between viscosity and temperature is effectively captured by Newton's Law of Viscosity, making option 'B' the correct choice.