With special device manufactured by ourselves, the free diffusing characteristics of oxygen in different granularity coal are tested under normal temperature condition.
以自行研制的煤对氧扩散特性测试装置为实验手段，在常温环境条件下测试了不同粒度松散煤体对氧的自由扩散特性。
The result shows that the coal broken degree is the main token factor for measuring the oxygen free-diffusing characteristics in coal.
结果表明：煤的破碎程度是氧在煤体表面扩散作用的主要度量因子；
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