Gas -Red gas cylinder on white background | Premium Vector Gas is a state of matter with no fixed shape or volume, where particles move freely and randomly to fill any container.
water vapour - Water vapour is the gaseous state of water, which is transparent and forms when liquid water evaporates or ice sublimates.
air - the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen.
2.
an impression of a quality or manner given by someone or something.
"she answered with a faint air of boredom"
liquid - A liquid is a state of matter that has a definite volume but no fixed shape, meaning it flows to conform to the shape of its container. Unlike solids, liquids can flow, and unlike gases, they maintain a constant volume and are nearly incompressible. Examples include water, milk, and oil.
solid - "Solid" can refer to a state of matter, a type of object in geometry, an adjective describing something dense or strong, or an acronym for SOLID design principles in software development.