Improved models regarding dense gas-particle two-phase flow are proposed.

提出了模拟稠密气固两相流动的改进模型。

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The model was then used to simulate dense gas-particle flows in downcomers.

用该模型对下行床内稠密两相流动进行了数值模拟。

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But the wall isn't impenetrable. It's riddled with "interstellar tunnels" that lead from one pocket of less dense gas to another.

但是这层气体并不是密不透风，它里面有很多星际“隧道”，把一个个局部空洞区域连起来。

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The entire city of Fort Worth sits over a gas dense layer of black rock called the Barnett Shale that only recently became possible to access.

NPR: Drilling for Gas in Dallas-Fort Worth

The new work focuses instead on cold, dense masses of gas that have markedly less random motion, and which emit their radiation in the microwave part of the electromagnetic spectrum.

BBC: Supermassive black hole weighed using new scale

The obvious solution getting people to breathe hydrogen cannot work either, because a lungful of hydrogen gas, being less dense than water, contains less hydrogen, and so would produce too weak an image.

ECONOMIST: Medical imaging