The difference between Gas and Vapour
When used as nouns, gas means matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid) (or held together by gravitational pull), whereas vapour means cloudy diffused matter such as mist, steam or fumes suspended in the air.
When used as verbs, gas means to kill with poisonous gas, whereas vapour means to become vapour.
Gas is also adjective with the meaning: comical, zany.
check bellow for the other definitions of Gas and Vapour
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Gas as a noun (uncountable, chemistry):
Matter in a state intermediate between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid) (or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly.
Examples:
"A lot of gas had escaped from the cylinder."
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Gas as a noun (countable, chemistry):
A chemical element or compound in such a state.
Examples:
"The atmosphere is made up of a number of different gases."
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Gas as a noun (uncountable):
A flammable gaseous hydrocarbon or hydrocarbon mixture (typically predominantly methane) used as a fuel, e.g. for cooking, heating, electricity generation or as a fuel in internal combustion engines in vehicles.
Examples:
"'Gas-fired power stations have largely replaced coal-burning ones."
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Gas as a noun (countable):
A hob on a gas cooker.
Examples:
"She turned the gas on, put the potatoes on, then lit the oven."
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Gas as a noun (US):
Methane or other waste gases trapped in one's belly as a result of the digestive process.
Examples:
"My tummy hurts so bad, I have gas."
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Gas as a noun (slang):
A humorous or entertaining event or person.
Examples:
"He is such a gas!"
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Gas as a noun (baseball):
A fastball.
Examples:
"The closer threw him nothing but gas."
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Gas as a noun (medicine, colloquial):
Arterial or venous blood gas.
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Gas as a verb (transitive):
To kill with poisonous gas.
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Gas as a verb (intransitive):
To talk, chat.
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Gas as a verb (intransitive):
To emit gas.
Examples:
"The battery cell was gassing."
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Gas as a verb (transitive):
To impregnate with gas.
Examples:
"to gas lime with chlorine in the manufacture of bleaching powder"
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Gas as a verb (transitive):
To singe, as in a gas flame, so as to remove loose fibers.
Examples:
"to gas thread"
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Gas as a noun (uncountable, US):
Gasoline; a derivative of petroleum used as fuel.
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Gas as a noun (US):
Gas pedal.
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Gas as a verb (US):
To give a vehicle more fuel in order to accelerate it.
Examples:
" The cops are coming. Gas it!"
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Gas as a verb (US):
To fill (a vehicle's fuel tank) with fuel.
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Gas as an adjective (Ireland, colloquial):
comical, zany; fun, amusing
Examples:
"Mary's new boyfriend is a gas man."
"It was gas when the bird flew into the classroom."
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Vapour as a noun:
Cloudy diffused matter such as mist, steam or fumes suspended in the air.
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Vapour as a noun:
The gaseous state of a substance that is normally a solid or liquid.
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Vapour as a noun (obsolete):
Wind; flatulence.
Examples:
"rfquotek Francis Bacon"
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Vapour as a noun:
Something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.
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Vapour as a noun (archaic, in the plural):
Hypochondria; melancholy; the blues; hysteria, or other nervous disorder.
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Vapour as a noun (dated):
Any medicinal agent designed for administration in the form of inhaled vapour.
Examples:
"rfquotek Brit. Pharm"
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Vapour as a verb (intransitive):
To become vapour; to be emitted or circulated as vapour.
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Vapour as a verb (transitive):
To turn into vapour.
Examples:
"to vapour away a heated fluid"
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Vapour as a verb (intransitive):
To use insubstantial language; to boast or bluster.
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Vapour as a verb:
To emit vapour or fumes.