Talk:Water activity

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[edit] Substance

Is the use of "substance" rigurous? A substance is either a chemical compound or a chemical element. Milk or honey are neither.

Would anybody be opposed to an expanded article? I was thinking adding a table that shows water activity ranges for specific bacteria, and uses of water activity in food quality and shelf stability.

[edit] Calculations

Would it be appropriate to list here some of the equations for predicting the Aw of a system? Say, the Norrish equation, Ross equation, etc.

I would love to see some.

"It [water activity] is defined as the vapor pressure of water divided by that of pure water at the same temperature; therefore, pure distilled water has a water activity of exactly one."

should this be: "It [water activity] is defined as the vapor pressure of a substance divided by that of pure water at the same temperature; therefore, pure distilled water has a water activity of exactly one." —Preceding unsigned comment added by 12.46.32.10 (talk) 21:22, 13 March 2008 (UTC)