The Invisible Hand in the Beaker: Reading for Agency in Science Prose

The sentence that hides its subject

Consider a familiar sentence from a science worksheet: The water was heated until bubbles formed. A pupil can answer what happened to the water. Ask who heated it, with what, why the temperature mattered, or who decided when to stop, and the sentence offers little. The grammar is not wrong. Passive voice is a legitimate convention in scientific writing, used to foreground procedure and reduce the prominence of individual experimenters. But for a novice reader, the convention can obscure the very causal chain the lesson is trying to teach.

Science teachers meet this problem constantly. Instructions say that the precipitate was filtered, the solution was titrated, or the circuit was connected. Reports say that the results were recorded or the sample was discarded. In each case, an action has been grammaticalised without an agent. The human hand behind the beaker has been edited out.

When processes become things

A related difficulty is nominalisation: the conversion of a verb or adjective into a noun. The water evaporated becomes the evaporation of the water. The student measured the volume becomes the measurement of volume. The mixture became acidic becomes the acidity of the mixture. Nominalisation is efficient. It allows writers to package a process and then discuss it as an object: the evaporation rate increased, the measurement error was small, the acidity changed over time.

For expert readers, these abstractions are useful. They compress information and support generalisation. For pupils, they can be barriers. A sentence such as the neutralisation of the acid was incomplete contains several ideas at once: an acid, a base, a reaction, a comparison with completeness, and an implied agent who judged the outcome. The nouns are dense, and the causal relationships are buried inside them.

This matters because science is not only a body of facts but a set of claims about cause and effect. Pupils need to track who or what acted, what was acted upon, under what conditions, and with what result. When agency disappears, the reader has to reconstruct it. Some pupils can do this quickly. Others, including many with English as an additional language, pupils with speech, language and communication needs, and pupils who read less fluently, are left with a sentence that sounds scientific but explains very little.

Why agency is a reading issue, not just a grammar issue

It is tempting to treat this as a grammar problem and to prescribe drills on active and passive voice. That approach has limits. Science writing uses passive constructions for good reasons: reproducibility, objectivity, and a focus on procedure rather than personality. The aim is not to purge passive voice from science. The aim is to help pupils read it strategically.

The reading demand is especially clear in examination questions. A GCSE question might ask pupils to explain why a student repeated a measurement, or to suggest why a result was anomalous. The question assumes that the pupil has understood who did what and why. If the preceding text has been written as a sequence of agentless events, the pupil may recognise the vocabulary but miss the human decisions that produced the data.

Reading science therefore involves more than decoding technical terms. It involves reconstructing the relationships that scientific prose often compresses. The following routines are short enough to use in ordinary lessons. They are not a grammar programme. They are ways of making the invisible visible.

Routines for unpacking agency

1. Find the verb, then ask who or what did it

Ask pupils to underline the main verb in a sentence and then ask: who or what carried out this action? If the sentence says the mixture was stirred, pupils can write in the margin: who stirred it? If the text is a general method, the answer may be the student or the experimenter. If the text is describing a natural process, the answer may be the current or the enzyme. The point is to make the missing agent explicit rather than leaving it as an unspoken assumption.

2. Restore the verb from the noun

Give pupils a nominalised sentence and ask them to turn the abstract noun back into a verb. The evaporation of the solvent occurred rapidly becomes the solvent evaporated rapidly. The measurement of the temperature was repeated becomes the student measured the temperature again. This routine is quick, and it makes the process visible again. It also helps pupils see that abstract nouns often contain hidden actions.

3. Draw a cause chain

Ask pupils to convert a sentence or short paragraph into an arrow diagram: agent, action, object, result. For example: The student heated the water, so the water evaporated, so the concentration of the solution increased. A diagram of this kind forces pupils to identify the links that prose may leave implicit. It works well with practical methods, data analysis, and explanations of natural processes.

4. Compare active and passive versions

Show pupils two versions of the same sentence: The student filtered the precipitate and the precipitate was filtered. Ask which version is more informative and which is more typical of scientific writing. The discussion should be brief and purposeful. The aim is not to declare one version better, but to help pupils understand why writers make particular choices and what those choices do to the reader.

5. Use margin notes for who, what and how

When reading a method or explanation, ask pupils to annotate three things in the margin: who did it, what was done, and how it was done. This can be done with a short text and a pencil. It takes five minutes and gives the teacher immediate evidence of whether pupils are tracking the science or merely recognising the words.

Keep the grammar light

These routines work best when they are embedded in science content rather than taught as isolated grammar. A pupil who is unpacking the solution was titrated is learning both about titrations and about how scientific language works. The teacher does not need to deliver a lesson on passive voice. A short explanation, a modelled example, and a quick guided practice are usually enough.

There is also a caution. Not every agentless sentence needs unpacking. Some scientific conventions are useful precisely because they generalise. Ice melts at zero degrees Celsius does not need a named person. The skill is to judge when the missing agent matters for understanding and when it does not. That judgement is part of reading science, and it can be taught.

At Science in Reading, we are interested in the small moves that make complex texts accessible without diluting the science. Reading for agency is one of those moves. It helps pupils see that scientific prose is written by people, about processes, for particular purposes. When the invisible hand in the beaker becomes visible again, the sentence is not just easier to read. It is more scientifically meaningful.