Rehydration Kinetics of Instant Rice
Mathematical Modeling of Water Absorption
Food engineers use the Peleg Model to study the rehydration kinetics of Instant Rice. This mathematical framework calculates the rate at which a dehydrated grain absorbs water based on temperature and time. The goal is to reach a moisture content of approximately $60$% to $65$% (the level of freshly cooked rice) as quickly as possible.
Studies show that the rehydration rate of instant rice increases exponentially with water temperature. For instance, rice that takes $5$ minutes to rehydrate in $100$°C water might take over $20$ minutes in $70$°C water. This data is used to provide the specific "boiling water" instructions found on consumer packaging, ensuring the starch reaches the ideal texture without becoming waterlogged.
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