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The noun 'hydrogen' is a mass noun (an uncountable noun) as a word for a substance.
Mass Noun
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Mass can be a noun or an adjective.
As a noun: The mass of a solid.
As an adj: Mass production.
The noun 'electricity' is a mass noun, a word for something that is indivisible into countable units.
No, a mass noun is an alternate term for an uncountable noun.
The noun 'jar' is a countable noun: one jar, a dozen jars.