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Class 11 Exam  >  Class 11 Questions  >  If drops and bubbles do not collapse under th... Start Learning for Free
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If drops and bubbles do not collapse under the effect of gravity, it indicates that
  • a)
    pressure inside the drop is greater than outside
  • b)
    pressure inside the drop is lower than outside it
  • c)
    Surface tension is low
  • d)
    Viscosity is large
Correct answer is option 'A'. Can you explain this answer?
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If drops and bubbles do not collapse under the effect of gravity, it i...
If drops and bubbles do not collapse under the effect of gravity, it indicates that the pressure inside the drop is greater than the pressure outside. The greater inner pressure prevents the drop from collapsing. 
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If drops and bubbles do not collapse under the effect of gravity, it i...
Understanding Pressure in Drops and Bubbles
When we think about drops and bubbles, it's essential to consider the forces at play. The stability of these structures against gravitational collapse is a crucial aspect of fluid mechanics.
1. Role of Pressure
- In a drop or bubble, the pressure inside is influenced by surface tension.
- Surface tension creates a pressure difference between the inside and outside of the drop or bubble.
2. Pressure Difference
- The pressure inside the drop is indeed greater than the pressure outside it.
- This pressure difference is what prevents the drop or bubble from collapsing under gravity.
3. Surface Tension's Influence
- Surface tension acts to minimize the surface area, forming a stable shape.
- The higher the surface tension, the greater the pressure difference, which enhances stability.
4. Viscosity and Stability
- While viscosity does play a role in the flow and deformation of fluids, it is not the primary reason for the stability of drops and bubbles against gravity.
5. Conclusion
- Thus, the correct answer to why drops and bubbles do not collapse under gravity is that the pressure inside the drop is greater than the pressure outside. This pressure difference, primarily due to surface tension, is crucial for maintaining the integrity of the drop or bubble despite gravitational forces.
Understanding these principles is foundational in fluid mechanics and helps explain various phenomena in nature and technology.
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Attempt All sub parts from each question.Newtonian and non-Newtonian fluid: Viscosity is the physical property that characterizes the flow resistance of simple fluids. Newton’s law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to a mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity. Newtonian fluids obey Newton’s law of viscosity. The viscosity is independent of the shear rate. Example: air, water, alcohol etc. Non-Newtonian fluids do not follow Newton’s law thus, their viscosity (ratio of shear stress to shear rat e) is not constant and is dependent on the shear rate. Example: honey, ketchup etc. Non-Newtonian fluids can be categorized into four types based on the way a fluid’s viscosity changes in response to variations in shear rate.• Pseudoplastic: Materials whose viscosity decreases as the shear rate increases. This type of flow behavior is sometimes called shear thinning. Example: Cake batter, agar-agar and fruit juice concentrates, nail polish etc.• Dilatant: M aterials whose viscosity increases as the shear rate increases. This type of behavior is sometimes called shear-thickening. Example: Suspension of corn starch in water and candy compounds etc..• Thixotropic: M aterials whose viscosity decreases when sheared at a constant rate over time. Example: Yogurt, gelatin gel, honey etc.• Rheopectic: M aterials whose viscosity increases when sheared at a constant rate over time. Example: Printer ink, gypsum paste etc.Q. Viscosity of thixotropic non-Newtonian fluid

Attempt All sub parts from each question.Newtonian and non-Newtonian fluid: Viscosity is the physical property that characterizes the flow resistance of simple fluids. Newton’s law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to a mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity. Newtonian fluids obey Newton’s law of viscosity. The viscosity is independent of the shear rate. Example: air, water, alcohol etc. Non-Newtonian fluids do not follow Newton’s law thus, their viscosity (ratio of shear stress to shear rat e) is not constant and is dependent on the shear rate. Example: honey, ketchup etc. Non-Newtonian fluids can be categorized into four types based on the way a fluid’s viscosity changes in response to variations in shear rate.• Pseudoplastic: Materials whose viscosity decreases as the shear rate increases. This type of flow behavior is sometimes called shear thinning. Example: Cake batter, agar-agar and fruit juice concentrates, nail polish etc.• Dilatant: M aterials whose viscosity increases as the shear rate increases. This type of behavior is sometimes called shear-thickening. Example: Suspension of corn starch in water and candy compounds etc..• Thixotropic: M aterials whose viscosity decreases when sheared at a constant rate over time. Example: Yogurt, gelatin gel, honey etc.• Rheopectic: M aterials whose viscosity increases when sheared at a constant rate over time. Example: Printer ink, gypsum paste etc.Q. Viscosity of pseudoplastic non-Newtonian fluid

Attempt All sub parts from each question.Newtonian and non-Newtonian fluid: Viscosity is the physical property that characterizes the flow resistance of simple fluids. Newton’s law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to a mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity. Newtonian fluids obey Newton’s law of viscosity. The viscosity is independent of the shear rate. Example: air, water, alcohol etc. Non-Newtonian fluids do not follow Newton’s law thus, their viscosity (ratio of shear stress to shear rat e) is not constant and is dependent on the shear rate. Example: honey, ketchup etc. Non-Newtonian fluids can be categorized into four types based on the way a fluid’s viscosity changes in response to variations in shear rate.• Pseudoplastic: Materials whose viscosity decreases as the shear rate increases. This type of flow behavior is sometimes called shear thinning. Example: Cake batter, agar-agar and fruit juice concentrates, nail polish etc.• Dilatant: M aterials whose viscosity increases as the shear rate increases. This type of behavior is sometimes called shear-thickening. Example: Suspension of corn starch in water and candy compounds etc..• Thixotropic: M aterials whose viscosity decreases when sheared at a constant rate over time. Example: Yogurt, gelatin gel, honey etc.• Rheopectic: M aterials whose viscosity increases when sheared at a constant rate over time. Example: Printer ink, gypsum paste etc.Q. A fluid, whose viscosity changes with the rate of deformation or shear stain is known as

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If drops and bubbles do not collapse under the effect of gravity, it indicates thata)pressure inside the drop is greater than outsideb)pressure inside the drop is lower than outside itc)Surface tension is lowd)Viscosity is largeCorrect answer is option 'A'. Can you explain this answer?
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