水すい分ぶん活かっ性せい

noun

water activity

Technical term in chemistry and food science; a measure of free water available for microbial growth, expressed as a ratio of vapor pressures.

• 食しょく品ひんの保ほ存ぞん性せいを評ひょう価かするために水すい分ぶん活かっ性せいを測そく定ていする。

  Water activity is measured to evaluate the shelf life of food products.

• 水すい分ぶん活かっ性せいが高たかいと微び生せい物ぶつが繁はん殖しょくしやすくなる。

  When water activity is high, microorganisms tend to grow more easily.