Question

The energy required for size reduction is proportional to the change in surface area of the pieces of food and is determined by ________.

• A. Ideal law
• B. Kick's law
• C. Rittinger's law
• D. Bond's law

Hint:

To easily remember the laws of size reduction:

\textbf{Rittinger} = Relates to \textbf{Surface Area} (fine particles)
\textbf{Kick} = Relates to \textbf{Volume/Size Ratio} (coarse particles)
\textbf{Bond} = The \textbf{Intermediate} law (broad range) \end{itemize}

Answer 1

The Correct Option is C

Step 1: Identify the question's topic. The question concerns comminution principles (size reduction), specifically the energy needed for particle breakdown. Key theories include Rittinger's law, Kick's law, and Bond's law.
Step 2: Define comminution laws.

Rittinger's Law: Energy required for size reduction is directly proportional to the new surface area. It's most accurate for fine grinding, where surface area increase is substantial.
Kick's Law: Energy required is proportional to the volume reduction. It's more applicable to coarse crushing of large particles, where minimal new surface area is created.
Bond's Law: Energy used is proportional to the new crack length. It's considered practical for a wider range of particle sizes.
Step 3: Match the statement to the correct law. The question states energy is "proportional to the change in surface area," which defines Rittinger's law.