Explain the effect of water activity on microbial growth and survival.

Water activity (aw) plays a crucial role in the growth, survival, and behavior of microorganisms in food. Water activity is defined as the ratio of the vapor pressure of water in a food sample to the vapor pressure of pure water at the same temperature. It essentially measures the availability of water in a given environment that microorganisms can use for metabolic activities. Unlike moisture content, which refers to the total amount of water present in a substance, water activity focuses on the free, unbound water that is available for biological processes.

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