The word airmass is a singular noun. The plural is airmasses.
Air does not remain in a given place. A country does not have an 'airmass'.
The warmer airmass that was coming would mark a positive change in the weather.
Cairo typically experiences a hot desert climate characterized by a dry, warm airmass known as a continental tropical (cT) airmass. This airmass brings high temperatures and low humidity, especially in the summer months. During winter, the city may occasionally be influenced by a maritime tropical (mT) airmass, which can bring slightly milder temperatures and increased humidity. Overall, the dominant airmass in Cairo contributes to its arid conditions.
An airmass that is very warm and dry would be classified as a continental tropical (cT) airmass. These airmasses form over hot and arid regions, such as deserts, and bring warm and dry conditions to areas they move into.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.