Nouns can be classified into two groups, countableand uncountable. Countable nouns typically occuras discrete units that can be counted, whereas uncountable nouns, also calledmass nouns, are typically substances or concepts.
Countable: electron, flask, joule
Uncountable: oxygen, heat, patriotism
Countable nouns can be made plural. Uncountable nounsare not used in the plural.
Countable: polar regions, transistors, earthquakes
Uncountable: carbon dioxide, infrared radiation, equipment
You can refer to discrete units of uncountable nouns by adding a counting word,such as a unit of measurement, or the general word piece.
a carbon dioxide; an equipment
a molecule of carbon dioxide; a piece of equipment
## Countable and Uncountable Nouns ##
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