Question:
Which law of size reduction is applicable when the surface area of particles is more important than size?
Which law of size reduction is applicable when the surface area of particles is more important than size?
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Logic Tip: Use this memory trick: Coarse = Kick's, Intermediate = Bond's, Fine (Surface Area) = Rittinger's.
Updated On: May 25, 2026
- Kick's law
- Rittinger's law
- Bond's law
- Newton's law
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The Correct Option is B
Solution and Explanation
Concept:
In mechanical size reduction (comminution), different empirical laws are used to estimate the energy required depending on the starting and ending sizes of the particles.
Step 1: Kick's law states that the energy required is proportional to the ratio of the initial and final sizes (volume). It is most accurate for coarse crushing.
Step 2: Bond's law is an intermediate law that states energy is proportional to the square root of the surface-to-volume ratio. It is used for intermediate grinding.
Step 3: Rittinger's law postulates that the energy required for size reduction is directly proportional to the new surface area created during the milling process.
Step 4: When fine grinding is performed, a massive amount of new surface area is generated. Because Rittinger's law is fundamentally based on surface area creation, it is the applicable law for this scenario.
In mechanical size reduction (comminution), different empirical laws are used to estimate the energy required depending on the starting and ending sizes of the particles.
Step 1: Kick's law states that the energy required is proportional to the ratio of the initial and final sizes (volume). It is most accurate for coarse crushing.
Step 2: Bond's law is an intermediate law that states energy is proportional to the square root of the surface-to-volume ratio. It is used for intermediate grinding.
Step 3: Rittinger's law postulates that the energy required for size reduction is directly proportional to the new surface area created during the milling process.
Step 4: When fine grinding is performed, a massive amount of new surface area is generated. Because Rittinger's law is fundamentally based on surface area creation, it is the applicable law for this scenario.
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