Question

How do you calculate water activity where P is vapor pressure of food and P₀ is vapor pressure of pure water?

• A. \( a_w \neq P/P_0 \)
• B. \( a_w = P/P_0 \)
• C. \( a_w \approx P/P_0 \)
• D. \( a_w = P/p \)

Hint:

Water activity is crucial in food preservation, affecting microbial growth and shelf life.

Answer 1

The Correct Option is B

Water activity (aw) is calculated using the formula \( a_w = P/P_0 \), where P is the vapor pressure of food and \( P_0 \) is the vapor pressure of pure water. This measurement indicates the availability of water for microbial growth, which is crucial in food preservation.