Well, look around. You are in 'air', the most natural gas, though not visible but you can feel it when it moves around you, that's called wind.
Do really you think that if it would keep it shape or form, that you could feel the wind blow from every direction? How can wind come from another side, come around the corner of that big building? Would that be possible if it were as 'fixed' as concrete?
Gas has no certain shape, however its volume can change with differences in heat and pressure.
gases always fill the container thay are in?
can gas change shape
Yes.
The volume of a gas is subject to change with temperature and pressure.
A gas is a substance with no definite shape or volume.
take up space and have particles
Heat causes substances to change their state because, when heated, the molecules within the substance to move around faster. The faster the molecules bounce about, the weaker they are held together.
All four states of matter could fill a container completely if there was enough of them.That said the properties of the 3 states of matter (that you need to know about for high/secondary school) are:Solid - Fixed shape and fixed volume.Liquid - No fixed shape but fixed volume.Gas - No fixed shape, no fixed volume and fill the space available.A large enough volume of liquid or solid could fill a container completely but only the smallest amount of a gas will fill the whole container.
A gas has no fixed volume or shape.
Gas
No it is not.
a gas
A solid has a fixed volume and does not change shape.
The volume of a gas is subject to change with temperature and pressure.
A gas is a substance with no definite shape or volume.
A liquid has a fixed volume but not a fixed shape. If you put it into a graduated cylinder, it will take the shape of the cylinder. If you put it into a bowl, it will take the shape of the bowl.
A gas
a gas
Gas has an indefinite shape or volume. Liquid has a fixed shape and volume. Solid has a fixed shape and volume.
A solid is a substance that has a fixed volume and a fixed shape, and a liquid has a fixed volume but not a fixed shape, and a gas has no fixed volume or shape.