Question

when a substance is said to be a gas ?

Answer 1

A substance is said to be a gas when it's all atoms or molecules separate or gets very loose like air.

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Answer 2

☢☢☢☢ FACTS TO KNOW ☢☢☢☢

✔ Gases are the third state of matter.

✔ Gases are also termed as "FLUIDS''.

✔ Gases have unique characteristics.

✔ Gases show a similar behaviour under specific temperatures, volumes, pressures.

✔ Gases have neither a definite shape nor a definite volume.

✔ Gases can be liquefied.

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A Substance can be said to be a gas if :

(1) It has no definite shape and volume.

(2) Its molecules are in ceaseless chaotic motion.

(3) Its density is least as compared to solids and liquids.

(4) It can be easily compressible.

(5) It can diffuse anywhere.

(6) It exerts pressure equally in all directions other than liquids.

(7) It expands to a large extent on heating and contracts to a large extent on cooling.

(8) Its intermolecular space is very large and its intermolecular force is almost negligible or is extremely weak.

(9) It can be liquefied.