The noun 'steel' is an uncountable (mass) noun, a word for a substance.
The noun 'efficiency' is a common noun.The noun 'efficiency' is an uncountable, abstractnoun as a word for the ability to be competent and effective.The noun 'efficiency' is a singular, concrete noun as a word for a one room apartment.
The noun 'plastic' is a common, uncountable(mass), concrete noun; a word for a type of substance; a word for a thing.The noun 'plastic' is a material noun as a word for something that other things are made from.The plural form of the noun, 'plastics' is a word for 'types of' or 'kinds of' plastic.The word 'plastic' is also an adjective.
The noun 'equipment' is an uncountable noun because it is a type of aggregate noun, a word that represents any number of elements or parts. It has no plural form. Units of equipment are expressed as some equipment, a lot of equipment, little equipment, etc.
Steel is a noun and so doesn't have any verb tenses.The past participle of the verb steal is stolen.
the number of steps of an algorithm will be countable and finite.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Transport is both countable and uncountable as a noun.
Shark is a countable noun.
countable
Countable
The noun 'daytime' is an uncountable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Pasta is a countable noun
Countable
The word 'violence' is an uncountable noun.
The gerund painting is a countable noun, as in "There are 12 paintings in this room."