Why is water activity important? 2. Do an online search to learn about four foods with low water activity. What organisms , if any. grow in these foods? 3. Do an online search to learn about four foods with high water activity. What organisms, any, grow in these foods

Biomedical Instrumentation Systems
1st Edition
ISBN:9781133478294
Author:Chatterjee
Publisher:Chatterjee
Chapter19: Biomedical Laboratory Instrumentation
Section: Chapter Questions
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1. Why is water activity important?

2. Do an online search to learn about four foods with low water activity. What organisms , if any. grow in these foods?

3. Do an online search to learn about four foods with high water activity. What organisms, any, grow in these foods?

4. go to https://www.metergroup.com/food/articles/microbial-growth/  What are the approximate water activity values of the organisms used in today's exercise?

5. List the media used in today's lab in order from that with the lowest water activity to that with the highest activity . On which do you expect to see growth of all the microbes ?

Expert Solution
Step 1

The water activity (a w) of a food is the ratio between the vapor pressure of the food itself, when in a completely undisturbed balance with the surrounding air media, and the vapor pressure of distilled water under identical conditions.

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