Yes, but it is not a pure substance or one whose content is chemically consistent, because it is a mixture of many elements, compounds, and water vapor. Although its general composition allows it to be used for experiments, its exact composition can vary by location, pressure, and temperature.
Hydrophobic material, they repel water.
Basically any physical thing than can be combined or made into another physical thing is a material. Just looking around my desk, plastic is a common material in my phone and some pens. Wood is a material in pencils, and the desk itself. Silicon is a material in the computer. Nitrogen is a material in the air.
Door sweep. It is a strip of material attached to the bottom of a door to prevent cold air from entering and warm air from escaping.
Sound is a compression/rarefaction wave in a material, such as air. There is no such thing on the moon.
No a material is something that you can hold and feel while air you can only feel it you can not really do anything physical with air.
No. A flame is not a living thing because it does not engage in metabolic activity, it does not reproduce sexually or asexually, and it lacks genetic material. The only relation it has to the living is that it needs air, specifically oxygen.
air
by radioactive material fell in the air
the hot air ballon is a thing
air
Air itself is not a material; it is a mixture of gases. However, the main component of air, nitrogen and oxygen, are both transparent to visible light. This is why we can see through air with our eyes.
Of course. If it is exposed to air or even skin, it can do majour damage. Ie. the nuclear explosion in Chernobyl.