Final answer:
The Haugh unit, a measure of egg quality, is calculated based on two factors: the height of the egg white and the weight of the egg. These factors are indicative of the egg's freshness and internal quality.
Step-by-step explanation:
The Haugh unit is a measure of egg quality, and it is calculated based on the height of the egg white (albumen) and the weight of the egg. These two factors help determine the freshness and quality of the egg. The height of the egg white is measured because, as an egg ages, the white tends to spread out more and the height decreases. The weight of the egg provides a basis for comparison to normalize the height measurement; this is because larger eggs naturally have thicker whites. Numerically, the value for the height in millimeters is added to 100 times the natural logarithm of the weight. The equation for calculating Haugh units is hence derived from these two measurements.