Question Bank • QB_EXP_DFE_STR_003 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Thermal Sterilization, Retort Processing & 12D Concept

Subtopic: Lethal rate calculation Bigelow method

Question Statement:

A can of food held at $116.1^\circ\text{C}$ has a lethal rate $L = 10^{\frac{T - 121.1}{z}}$. Taking $z = 10.0^\circ\text{C}$, the lethal rate $L$ at this temperature is ________ (round off to three decimal places).

Answer Key:

0.316

Step-by-Step Solution & Explanation

Lethal rate is: $L = 10^{\frac{T - 121.1}{z}} = 10^{\frac{116.1 - 121.1}{10.0}} = 10^{\frac{-5.0}{10.0}} = 10^{-0.5} = \frac{1}{\sqrt{10}} \approx 0.3162$ Rounding to three decimal places: $0.316$.
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