Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Mercury is regular. It follows the -ies Conversion rule.
Use plural verbs: "The mercuries are ready" (not "is ready").
Yes. The plural mercuries is standard across all English variants.
The word mercury follows the standard English pluralization rule. When forming the plural, mercury becomes mercuries. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why mercury becomes mercuries helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using mercuries in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The mercuries are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.