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sci.water-activity-food Calculator
Calculates water activity aw = p/p₀ (vapour pressure of water in food/pure water vapour pressure) from concentration, temperature, or Clausius-Clapeyron for dissolved species. aw > 0.91 supports Staphylococcus aureus growth — minimum aw for Clostridium botulinum growth: 0.93.
Inputs
Aw
Reference formula or conversion factor shown for context.
Temperature C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Salt Pct
Amount of solute per unit volume. Higher concentration = more solute dissolved.
Results
water activity aw
Water activity (aw) — the ratio of vapour pressure to pure water at the same temperature. Above 0.85: microbiological growth risk. Below 0.6: most microbes cannot grow.
microbial growth risk
The absolute increase in value over the period. Growth = final value minus initial value.
relative shelf life estimate
The value at the specified point or condition.
NaCl adjusted aw
Sample size or count used in the calculation.
critical aw values
The computed numeric or monetary value.
FAO/WHO Codex
Reference formula or conversion factor shown for context.