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Questions and Answers
What is the unit of surface energy?
What is the unit of surface energy?
- Kilojoule per liter (kJ/L)
- Newton per meter (N/m)
- Pascal (Pa) mi
- Joule per meter squared (J/m²) (correct)
Which of the following correctly defines the dimension of surface energy?
Which of the following correctly defines the dimension of surface energy?
- [M][L]^2[T]^{-2} (correct)
- [M][L][T]^{-2}
- [M][L]^{-1}[T]^{-2}
- [M][L]^3[T]^{-2}
What is a plausible alternative unit for measuring surface energy?
What is a plausible alternative unit for measuring surface energy?
- Joule per second (J/s)
- Newton per centimeter (N/cm)
- Calorie per meter squared (cal/m²) (correct)
- Watt per meter (W/m)
Which of the following quantities is NOT related to surface energy?
Which of the following quantities is NOT related to surface energy?
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In the context of surface energy, what does a high surface energy indicate?
In the context of surface energy, what does a high surface energy indicate?
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Study Notes
Surface Energy Units
- Surface energy is measured in Joules per square meter (J/m²).
- This unit reflects the energy required to create a new surface area.
- An alternative unit for surface energy is ergs per square centimeter (erg/cm²).
Surface Energy Dimensions
- The dimension of surface energy is [M L¹ T⁻²].
- This translates to mass (M), length (L), and time (T).
Surface Energy and Related Quantities
- Surface tension is directly related to surface energy.
- Intermolecular forces play a crucial role in determining surface energy.
- Wettability is a phenomenon influenced by surface energy.
High Surface Energy
- A high surface energy indicates a material's strong attraction between molecules.
- This results in a tendency to minimize surface area, leading to phenomena like capillary action and cohesion.
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