Which size reduction law states that the size reduction is directly proportional to the new surface formed?

• A. Kick's Law
• B. Rittiger's Law
• C. Bond's Law
• D. NOTA

Answer: (B)

Rittinger’s law says that the energy required for size reduction is proportional to the amount of new surface area created. When particles are ground to finer sizes, a lot more surface area is generated relative to the change in volume, so the work needed grows with how much new surface is formed. That’s why this law is described as size reduction being directly tied to the new surface created. The usual way to express it is that W is proportional to the increase in surface area, and in a common form W = kR (1/df − 1/di), where di is the initial size and df is the final size. In contrast, Kick’s law ties energy to the size reduction ratio, which suits coarse crushing, and Bond’s law uses a work index related to feed and product sizes for grinding.