Based on volume averaging theory, natural convection model for melting phase change in porous media was established.
根据体积平均理论，建立多孔介质中融化相变过程自然对流模型。
Carbon dioxide is a minor but important constituent of the atmosphere, averaging about 0.03% or 300 PPM by volume.
二氧化碳是空气的含量较小但很重要的组成成分，体积比平均约为0.03%或300ppm。
Carbon dioxide is a minor but important constituent of the atmosphere, averaging about 0.03% or 300 PPM by volume.
二氧化碳是空气的含量较小但很重要的组成成分，体积比平均约为0.03%或300ppm。
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