How to Write an Active Vs Passive Voice for Physics

Physics writing requires a delicate balance between active and passive voice to distinguish between the researcher's choices and universal physical laws. While modern journals like 'Nature Physics' encourage the active voice for clarity, the passive voice remains essential for describing reproducible experimental procedures where the observer is irrelevant.

What Is an Active Vs Passive Voice in Physics?

In physics, the active voice attributes an action directly to the agent (e.g., 'We measured the flux'), while the passive voice focuses on the object or the phenomenon itself (e.g., 'The flux was measured'). The distinction is critical in physics because it separates the subjective actions of the experimentalist from the objective behavior of the physical system being studied.

Before You Start

• Consult the style guide for your target journal, such as the American Physical Society (APS) or Institute of Physics (IOP) guidelines.
• Identify the 'agent' in your sentence: is it the researcher, the particle, or the mathematical operator?
• Determine if the focus of the sentence is the methodology (passive) or the logical derivation (active).
• Review your data plots to ensure your verbal descriptions match the precision of your visual evidence.

Use Active Voice for Mathematical Derivations

When navigating through a proof or a theoretical derivation, use the active voice to lead the reader through the logic. This makes the progression of equations feel natural and intentional.

Example: We substitute the Schrödinger equation into the Hamiltonian to find the energy eigenvalues.

Tip: Use 'we' even if you are the sole author, as it invites the reader to follow the logic alongside you.

Apply Passive Voice for Experimental Setup

In the 'Methods' or 'Experimental Section', use the passive voice to emphasize that the results would be the same regardless of who performed the task. This reinforces the principle of reproducibility.

Example: The cryostat was cooled to a base temperature of 10 mK using a dilution refrigerator.

Tip: Avoid 'I cooled the cryostat,' as the cooling process is a function of the equipment, not the person.

Highlight Physical Laws with Active Voice

When a physical entity or law is the primary actor, use the active voice to describe its behavior. This gives the phenomenon agency and clarity.

Example: The Lorentz force accelerates the electrons toward the anode.

Tip: Ensure the subject of your sentence is the actual physical force causing the change.

Switch to Passive to Avoid Repetitive 'We'

If your manuscript becomes cluttered with 'We observed' and 'We calculated,' use the passive voice to shift the focus back to the data and break the monotony.

Example: A significant shift in the Raman peak was observed at high pressures.

Tip: Read your paragraph aloud; if three sentences in a row start with 'We', flip the third one to passive.

Use Active Voice to State Research Goals

In the introduction, use the active voice to clearly state the objectives of your study. This shows confidence and defines the scope of your work.

Example: In this paper, we demonstrate a new method for measuring entanglement entropy.

Tip: Strong verbs like 'demonstrate', 'propose', and 'analyze' work best here.

Maintain Passive Voice for Standard Procedures

When describing routine calibrations or standard data cleaning that any physicist would perform, stick to the passive voice.

Example: The data were normalized using a standard Gaussian filter.

Tip: Remember that 'data' is plural in physics writing; use 'data were' rather than 'data was'.

Use Active Voice for Concluding Interpretations

When you are interpreting what your results mean, the active voice helps distinguish your conclusions from the raw data.

Example: We attribute the discrepancy in the heat capacity to spin-lattice relaxation.

Tip: This clarifies that this is your specific interpretation of the findings.

Common Mistakes to Avoid

• Using the passive voice for mathematical steps, which makes the derivation feel disconnected and difficult to follow.
• Overusing the active voice in the 'Methods' section, making it sound like a personal diary rather than a scientific report.
• Anthropomorphizing inanimate objects in active voice (e.g., 'The telescope intended to find stars').
• Switching voices mid-sentence, which disrupts the flow of a technical description.
• Using 'We' to describe a phenomenon that happens naturally without human intervention.

Pro Tips

• Check the 'Physical Review Letters' recent issues to see the current trend of active voice in your specific subfield.
• Use the active voice when discussing the results of other researchers to clearly credit their work.
• When writing about quantum mechanics, use active voice for operators (e.g., 'The operator acts on the state').
• Reserve the passive voice for describing 'constraints' or 'limitations' to maintain a neutral tone.
• If a sentence in passive voice requires a 'by us' at the end, rewrite it in the active voice.

Frequently Asked Questions

Is it okay to use 'I' in a physics paper?

While 'we' is the standard convention even for single-author papers in physics, some journals allow 'I'. However, 'we' is generally preferred as it represents the scientific community or the reader-author collaboration.

Should the abstract be in active or passive voice?

The abstract should use a mix. Use active voice for the main finding ('We report the discovery of...') and passive voice for the supporting methodology ('Measurements were performed via...').

Why does my professor insist on the passive voice?

Older conventions in physics emphasized the 'objective' nature of science by removing the human element. While modern styles prefer active voice for clarity, some traditionalists still prefer the passive voice for formal reports.

Does active voice make physics writing less formal?

No, active voice often makes physics writing more precise and easier to read, which is a hallmark of high-quality professional communication in the field.

Related Resources

• How to Write an Active Vs Passive Voice for Computer Science

• How to Write an Active Vs Passive Voice for Biology

• How to Write an Active Vs Passive Voice for Psychology

• How to Write a Sentence Rewriting for Physics

• How to Write Topic Sentences for Physics

• How to Write a Paragraph Structure for Physics

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