Glossary term: 气体
Description: 在物理学中，气体是一种物质状态，在这种状态下，分子或原子彼此松散地结合在一起，从而允许原子和分子以不同的速度持续而混乱地向四面八方运动。我们呼吸的空气就是氮气和氧气等气体的混合物。气体温度可由气体粒子运动的平均能量来度量。气体压强（例如施加在容器壁上的压强）主要是由是气体粒子撞击容器壁并反弹的效应所产生的。在天文学中，我们会遇到多种形式的气体，例如星际气体云、巨型分子云、星系际气体或行星大气层。天文学家所说的气体还包含等离子体（其中的原子被电离）——例如，他们把恒星称为“气体球”——以及在吸积盘中旋转的气体。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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