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