gas void fraction的用法和樣例：
例句
- However, due to the low temperature in winter, the rate of gas production in the marsh gas tank becomes lower, even the marsh gas tanks are frosted.
但我國北方冬季氣溫低，導致沼氣池產氣率低，甚至出現凍裂池體等現象。 - Distribution of reaction zones affects the heating value of producer gas and the rate of gas generation, as well as tar content and particulates.
氣化爐內之反應區分佈狀況不但會對產氣熱值與產氣率產生影響，同時也會影響焦油與粒子之生成量。
