Why are most gases invisible?
In the air around us, the molecules of gases usually so far apart that our eyes can’t detect them although – with a few, it’s possible to detect hem by smell. Gases have no firm shape or form. Their molecules move rapidly in every direction to fill whatever container they are in, or escape if the container has no lid.
States of matter
Solid
The molecules in a solid object are tightly packed together. Solids have a fixed volume and a definite shape that is not easy to change.
Liquid
Molecules in liquid can move past each other, allowing the substance to flow, Liquids have a fixed volume but no definite shape.
Gas
Molecules in a gas are free to move around, filling all the space around them. Gases have no fixed shape or volume.
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