Countable vs. Uncountable Nouns in Scientific Writing: Rules, Examples, Tips

Getting your Trinity Audio player ready...

Contents

• The Core Distinction
• Nouns That Shift Between Countable and Uncountable
• Discipline-Specific Challenges
• A Reference List of Frequently Misused Scientific Nouns
• Strategies for Accurate Usage
• Special Topics in Scientific Noun Usage
• Putting It All Together
• Frequently Asked Questions

Choosing between a countable and an uncountable noun affects not only grammar but also the clarity and credibility of scientific prose. An error in this area, such as writing ‘informations’ or ‘a research,’ signals unfamiliarity with academic conventions and can undermine an otherwise rigorous manuscript. These errors are among the most frequently flagged issues in manuscripts submitted by non-native English writers, and professional language editing services such as Editage are specifically equipped to identify and correct them before journal submission. This guide explains the countable/uncountable distinction, highlights the specific challenges that arise across disciplines, and provides practical tools for making accurate decisions in your own writing.

The Core Distinction

Nouns in English divide into two fundamental categories based on whether they refer to discrete, separable units or to continuous, undivided substances and concepts.

Feature	Countable Nouns	Uncountable Nouns
Can be counted?	Yes	No
Takes a/an?	Yes (singular)	No
Takes a number?	Yes (one experiment, two cells)	No
Singular form	Regular	Always treated as singular
Plural form	Regular (experiments, cells)	No standard plural
Quantified by	Numbers, many, few	Much, little, some, a great deal of

The distinction is not always intuitive, particularly because many nouns that are uncountable in academic English are countable in everyday speech, and because some nouns shift category depending on context.

Singular Agreement

Uncountable nouns always take singular verb forms, regardless of how large or varied the mass they describe may be:

• Correct: The equipment was calibrated before each trial.
• Incorrect: The equipment were calibrated before each trial.
• Correct: Much of the evidence points toward a viral etiology.
• Incorrect: Many of the evidences point toward a viral etiology.

Articles and Determiners

The indefinite article ‘a’ or ‘an’ cannot precede an uncountable noun used in its mass sense. This is one of the most common errors in manuscripts by non-native English writers:

• Incorrect: We conducted a research on adolescent sleep patterns.
• Correct: We conducted research on adolescent sleep patterns.
• Correct: We conducted a study on adolescent sleep patterns.
• Incorrect: The team observed a rapid progress in wound healing.
• Correct: The team observed rapid progress in wound healing.

Nouns That Shift Between Countable and Uncountable

Some nouns behave differently depending on how they are used. Recognizing these context-dependent shifts is essential for precision in scientific writing.

Countable in One Sense, Uncountable in Another

Many scientific nouns move between categories depending on whether they refer to a specific instance or to the concept in general:

Noun	Uncountable Use	Countable Use
light	Light travels at approximately 3 x 10^8 m/s.	The researchers used two lights to simulate dawn conditions.
culture	Culture shapes health-seeking behavior.	Three cultures of E. coli were prepared.
pressure	Pressure was measured continuously.	A pressure was applied to each specimen.
work	Further work is needed to confirm these findings.	The works of Durkheim inform this framework.
space	Space is curved in the presence of mass.	The laboratory spaces were redesigned for biosafety.

Plural Forms With Shifted Meaning

Certain uncountable nouns acquire specific, often technical meanings when used in the plural. Writers should use these forms deliberately:

• ‘behavior’ (general, uncountable) vs. ‘behaviors’ (specific observable acts, countable in psychology)
• ’tissue’ (biological material, uncountable) vs. ’tissues’ (distinct tissue types, countable in anatomy)
• ‘water’ (the substance, uncountable) vs. ‘waters’ (distinct bodies of water, countable in ecology and geography)

Discipline-Specific Challenges

Each scientific field carries its own vocabulary of problem nouns. The following sections identify the most frequently misused nouns in four major domains, with correct and incorrect usage illustrated.

Biomedical Sciences

Biomedical writing involves a mix of technical terms borrowed from Latin and Greek, many of which are systematically uncountable in academic English even when they appear discrete:

Noun	Correct Use	Common Error
research	The research was conducted over 18 months.	The researches were conducted over 18 months.
evidence	Evidence supports a role for interleukin-6.	Evidences support a role for interleukin-6.
equipment	The equipment includes a flow cytometer.	The equipments include a flow cytometer.
progress	Significant progress has been made in gene therapy.	Significant progresses have been made.
knowledge	Current knowledge of the microbiome is incomplete.	Current knowledges of the microbiome are incomplete.
advice	Clinical advice was provided to all participants.	Clinical advices were provided to all participants.

A particular challenge arises with ‘data,’ which is grammatically plural (the singular is ‘datum’) but is treated as uncountable or collective singular in many journals:

• Plural treatment (technically correct): The data were analyzed using SPSS.
• Singular treatment (widely accepted): The data was analyzed using SPSS.
• Best practice: follow the style guide of your target journal consistently throughout the manuscript.

Physical Sciences

Physics, chemistry, and materials science generate specific terminology that is often misapplied, especially by writers translating from languages where cognates are countable:

Noun	Correct Use	Common Error
information	This information was derived from spectral analysis.	These informations were derived from spectral analysis.
energy	Kinetic energy is conserved in elastic collisions.	Kinetic energies are conserved in elastic collisions.
heat	Heat was transferred at a rate of 50 W.	Heats were transferred at a rate of 50 W.
matter	Dark matter constitutes approximately 27% of the universe.	Dark matters constitute approximately 27% of the universe.
hydrogen	Hydrogen was introduced at a partial pressure of 0.5 atm.	Hydrogens were introduced…
feedback	Negative feedback stabilizes the system.	Negative feedbacks stabilize the system.

Note that some substance nouns become countable in comparative or categorical use:

• Correct: The steels used in this study differed in carbon content. (referring to distinct alloy types)
• Correct: Steel is a versatile structural material. (general mass noun sense)

Social Sciences

Social science writing presents unique difficulty because many core theoretical concepts are abstract nouns that are uncountable but are often mistakenly pluralized:

Noun	Correct Use	Common Error
behavior	Prosocial behavior increased following the intervention.	Prosocial behaviors increased… (unless referring to distinct acts)
inequality	Economic inequality was measured using the Gini coefficient.	Economic inequalities were measured… (unless comparing types)
poverty	Poverty was operationalized as income below the national threshold.	Poverties were operationalized…
violence	Structural violence operates through institutional neglect.	Structural violences operate…
methodology	A mixed-methods methodology was adopted.	Mixed-methods methodologies were adopted. (for one approach)
software	The software was used to code qualitative responses.	The softwares were used to code…

‘Behavior’ deserves special attention. In psychology, ‘behaviors’ (plural, countable) is acceptable and common when referring to specific, operationally defined acts: ‘Three aggressive behaviors were recorded per session.’ In sociology, the mass noun sense is generally preferred.

Humanities

Humanities scholarship often involves dense abstract vocabulary. Some of the most persistent errors in this domain involve nouns borrowed from French or Latin, where they carry countable properties that they do not retain in English:

Noun	Correct Use	Common Error
literature	The literature on memory studies is extensive.	The literatures on memory studies are extensive. (use ‘bodies of literature’ if comparing)
discourse	Postcolonial discourse challenges Eurocentric frameworks.	Postcolonial discourses challenge… (unless distinguishing multiple distinct discourses)
evidence	Textual evidence supports this interpretation.	Textual evidences support this interpretation.
music	Early modern music was primarily vocal.	Early modern musics were primarily vocal.
criticism	Feminist criticism has transformed the field.	Feminist criticisms have transformed…
philosophy	Stoic philosophy emphasizes rational control.	Stoic philosophies emphasize… (use ‘philosophical traditions’ if plural)

A Reference List of Frequently Misused Scientific Nouns

The table below consolidates the most commonly misused uncountable nouns across scientific disciplines. All of these nouns are uncountable in standard academic English unless otherwise noted.

Noun	Category	Notes on Use
advice	General academic	Never pluralized; use ‘recommendations’ for a countable alternative
behavior	Social and biomedical sciences	Pluralized only when referring to distinct, coded acts
data	All sciences	Technically plural; treated as mass noun in many style guides
equipment	All sciences	Never pluralized; use ‘instruments’ or ‘devices’ for countable alternatives
evidence	All disciplines	Never pluralized; use ‘pieces of evidence’ or ‘indicators’
feedback	All disciplines	Never pluralized in the abstract sense
information	All disciplines	Never pluralized; use ‘data points’ or ‘items’ for countable sense
knowledge	All disciplines	Never pluralized; use ‘bodies of knowledge’ if comparing domains
literature	Humanities and social sciences	Use ‘bodies of literature’ or ‘fields’ if comparing
methodology	All disciplines	Refers to the system of methods; pluralize only when comparing frameworks
progress	All disciplines	Never pluralized
research	All disciplines	Never pluralized; use ‘studies’ or ‘investigations’ for countable alternatives
software	All disciplines	Never pluralized; use ‘programs’ or ‘applications’ for countable alternatives
training	Biomedical and social sciences	Never pluralized in the process sense
violence	Social sciences and humanities	Use ‘forms of violence’ or ‘acts of violence’ for specificity
work	Humanities and social sciences	Mass noun when referring to effort; countable when referring to texts or outputs

Strategies for Accurate Usage

The Substitution Test

When uncertain whether a noun is countable in a given context, apply this three-step check:

• Step 1: Try inserting ‘a’ or ‘an’ before the noun. If the result sounds wrong, the noun is uncountable in that context.
• Step 2: Try adding a number. ‘Three researches’ sounds wrong; ‘three studies’ sounds correct. Substitute the uncountable noun with its countable equivalent.
• Step 3: Try inserting ‘much’ vs. ‘many.’ Uncountable nouns take ‘much’ (much evidence, much progress); countable nouns take ‘many’ (many experiments, many findings).

Use Countable Container Nouns

When you need to quantify an uncountable noun, pair it with a countable container noun:

Uncountable Noun	Countable Alternative
research	a study, an investigation, a trial, a project
evidence	a piece of evidence, an indicator, a finding
information	a data point, an item, a detail, a record
feedback	a comment, a suggestion, a response
knowledge	a concept, a principle, a theory, a framework
equipment	a device, an instrument, a tool, an apparatus
software	a program, an application, a tool, a package
literature	a source, a study, an article, a text

Discipline-Specific Style Guides

Because usage norms vary across journals and fields, always consult the appropriate authority:

• American Psychological Association (APA) Style: governs most social science and psychology journals, including guidance on ‘data’ as plural
• American Medical Association (AMA) Manual of Style: governs biomedical writing, with specific entries on commonly misused terms
• Chicago Manual of Style: widely used in humanities, with detailed treatment of mass nouns and abstract vocabulary
• Council of Science Editors (CSE) Style: used in biological and natural sciences
• Target journal guidelines: always check the journal’s own instructions to authors for any overriding preferences

Professional Language Editing

Even experienced researchers who are proficient in English can overlook systematic noun countability errors, particularly when those errors reflect patterns from their native language. Before submitting a manuscript, consider the following steps:

• Perform a final read-through focused exclusively on noun countability, separate from content review
• Engage a professional language editing service: Editage offers expert review by subject-matter editors who are trained to catch precisely these kinds of grammatical errors, including incorrect pluralization of mass nouns and misuse of articles with uncountable nouns
• Collaborate with a native English-speaking co-author or colleague who can flag systemic patterns
• Keep a personal error log that records recurring noun errors for targeted attention in future manuscripts

Special Topics in Scientific Noun Usage

Latin and Greek Plurals

Scientific vocabulary inherited from classical languages creates additional complexity because these nouns carry their own plural forms, some countable and some not:

Singular	Plural	Status	Example in Use
datum	data	Countable (but often treated as mass)	The data are/is stored in the repository.
criterion	criteria	Countable	Three criteria were applied.
phenomenon	phenomena	Countable	The phenomena were reproducible.
medium	media	Countable (in biology); mass in communication	Growth media were prepared fresh.
hypothesis	hypotheses	Countable	Two hypotheses were tested.
analysis	analyses	Countable	The analyses revealed distinct clusters.
bacterium	bacteria	Countable	Bacteria were cultured on selective agar.
stratum	strata	Countable	Four demographic strata were identified.

A persistent error is using the plural form as singular: ‘The criteria is…’ or ‘The phenomena was…’ Both are incorrect. If you are referring to a single item, use the singular form: ‘The criterion is…’ and ‘The phenomenon was…’

Abstract Nouns in Theoretical Frameworks

Theoretical and conceptual writing in the humanities and social sciences requires particular care with abstract nouns, which are almost always uncountable:

• ‘Agency,’ ‘power,’ ‘resistance,’ ‘identity,’ ‘meaning,’ and ‘memory’ are all mass nouns in standard theoretical usage.
• When writers wish to refer to multiple instances, they should use qualified expressions: ‘forms of power,’ ‘modes of resistance,’ ‘sites of memory.’
• The pluralization of abstract nouns, such as ‘identities’ or ‘memories,’ is acceptable only when referring to distinct, individual instances held by different people or groups: ‘Participants’ cultural identities were diverse.’

Putting It All Together

Mastering the countable/uncountable distinction is a cumulative process. Writers who read widely in their discipline, consult authoritative style guides, and revise with attention to noun grammar will gradually internalize the patterns. For researchers who write in English as an additional language, the learning curve can be steep, and errors may persist even after careful self-editing. In such cases, submitting your manuscript to a dedicated service such as Editage provides an additional layer of quality assurance: editors with expertise in your subject area will not only correct surface errors but will also identify systemic patterns of misuse and explain the corrections, helping you improve your writing over time. A single editing pass before submission can significantly reduce the risk of desk rejection on linguistic grounds and strengthen your manuscript’s overall presentation.

Frequently Asked Questions

Is ‘research’ ever countable in scientific writing?

In standard academic English, ‘research’ is uncountable and should not take ‘a’ or a plural form. The correct countable alternatives are ‘a study,’ ‘an investigation,’ ‘a trial,’ or ‘a project.’ Some informal or commercial contexts use ‘a research’ but this is not accepted in peer-reviewed scientific writing.

Should I write ‘the data is’ or ‘the data are’?

Both forms are in current use. ‘Data are’ is technically correct because ‘data’ is the plural of the Latin ‘datum.’ However, many journals, particularly in the biomedical and social sciences, now accept ‘data is’ when data is treated as a collective mass noun. The most important principle is consistency: choose one form and apply it throughout the manuscript, and defer to the style guide of your target journal.

Can ‘behavior’ be pluralized in a psychology paper?

Yes, with important conditions. In psychology and behavioral neuroscience, ‘behaviors’ is acceptable and common when referring to specific, operationally defined, observable acts that have been coded or counted: ‘Five aggressive behaviors were recorded per session.’ When referring to behavior as a general domain or construct, the mass noun form is preferred: ‘Avoidance behavior was the primary outcome.’

What is the difference between ‘methodology’ and ‘method’?

‘Methodology’ refers to the overall system, rationale, and theoretical underpinning of the research approach. It is typically uncountable in its abstract sense: ‘A qualitative methodology was adopted.’ ‘Method’ is countable and refers to a specific procedure or technique: ‘Three methods were used to verify the results.’ Avoid writing ‘methodologies’ when you mean ‘methods,’ as this inflates the register without adding precision.

Why is ‘information’ always uncountable?

‘Information’ in English refers to content or knowledge as an undifferentiated mass, not as discrete units. You cannot count individual ‘informations.’ To refer to specific units, use ‘pieces of information,’ ‘data points,’ ‘items,’ or ‘details.’ This applies equally across all disciplines, including computer science, where ‘information’ remains uncountable regardless of how technical the context.

Is it correct to write ‘evidences’ in a legal or humanities context?

No. ‘Evidence’ is uncountable in all standard academic registers, including law, history, and the natural sciences. The plural form ‘evidences’ is archaic and is not accepted in peer-reviewed writing. To indicate multiple pieces, writers should use expressions such as ‘pieces of evidence,’ ‘sources of evidence,’ ‘indicators,’ or simply ‘findings.’

How should I handle uncountable nouns when writing in a second language?

The most effective strategy is to build a discipline-specific list of uncountable nouns that are countable in your native language. Keep this list visible during drafting and revision. Use countable container nouns as substitutes when you need to quantify: instead of ‘a knowledge,’ write ‘a concept’ or ‘a principle.’ Run a targeted search of your manuscript for the indefinite article ‘a’ followed by commonly uncountable nouns before submission. For a comprehensive pre-submission check, Editage provides expert correction of these and related grammatical issues, with subject-specific editors across all major scientific disciplines.

Can ‘literature’ be pluralized in academic writing?

In most contexts, ‘literature’ is used as an uncountable noun: ‘The literature on climate adaptation is growing.’ The plural ‘literatures’ is occasionally used in comparative or interdisciplinary writing when explicitly comparing distinct bodies of scholarship across fields or languages: ‘The English and French literatures on this topic diverge significantly.’ Outside of such deliberate comparative contexts, prefer ‘bodies of literature,’ ‘fields,’ or ‘scholarly traditions.’