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I searched Google, but I couldn't get exact result.

I think question is clear. Do you add 's' or not? 1.5 meter or meters , ...

Sir Meysam Ferguson
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2 Answers2

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For straightforward expressions of volume, you would keep the 's':

Here's 1.3 liters of beer.
The volume of this beer glass is 1.3 liters.
If I drink more than 1.3 liters of beer, I like to have some chips on the side.

For use as an adjective, omit the 's':

Please give me a 1.3 liter glass of beer

here, you're using '1.3 liter' as an adjective in the same way that you might use 'large'. In this usage, some people would hyphenate to '1.3-liter': Hyphen in physical quantities before nouns?.

It's similar with meters and most units - hence you would say that in a hundred-meter race, the athletes have to run one hundred meters. You would say it that way even if you were abbreviating to '100m' too.

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Нет войне
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  • As and adjective, is this true ---> Three 20 year old boys – Sir Meysam Ferguson Oct 22 '16 at 07:35
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    'Three 20 year old boys' is correct, though you will often see hyphens in ages : 20-year-old. Some people might also put a hyphen in '1.3-liter' too : http://english.stackexchange.com/questions/112297/hyphen-in-physical-quantities-before-nouns – Нет войне Oct 22 '16 at 07:38
  • It's not just the same with metres and other measurements, but with (almost) all nouns used attributively. It's also a five-man army, but an army of five men, for instance. – Janus Bahs Jacquet Oct 22 '16 at 12:16
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Before the noun: a 1.5 meter wall. Otherwise: the wall is 1.5 meters long.

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