气体
近义词与同义词
按词义分组列出，使用时请结合具体语境。
a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container