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In a specified system, water activity is defined as the ratio of _____

(a) Fugacity of water vapor to fugacity of pure water at the specified system temperature and 1 atmospheric pressure

(b) Fugacity of pure water at the specified system temperature and 1 atmospheric pressure to fugacity of water vapor

(c) Fugacity of pure water at the specified system temperature and 1 atmospheric pressure

(d) Fugacity of water vapor

The question was asked in my homework.

This intriguing question comes from Principles of Semi-Moist Foods-1 topic in section Principles of Semi-Moist Foods, Principles of Food Preservation by Fermentation, Principles of Food Pickling and Curing and Principles of Food Storage Stability of Food Engineering

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Best answer
Right option is (a) Fugacity of water vapor to fugacity of pure water at the specified system temperature and 1 atmospheric pressure

For explanation I would say: In a specified system, water activity is defined as the ratio of fugacity of water vapor to fugacity of pure water at the specified system temperature and 1 atmospheric pressure.

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