Because active-voice sentences are clearer, livelier, and often more concise than passive-voice sentences, most style guides advise scientific authors to prefer the active voice in their writing.Notice though, that the recommendation is not to write entirely in the active voice.
The topic in the third sentence connects backward and prepares the reader for the upcoming information.
These three sentences are more cohesive as a result.
When discussing an experimental procedure in the Methods section, a researcher might write: The sentences could be converted to active voice by writing the following: We kept the honey bees in a humidified chamber at room temperature overnight. (In fact, the second sentence is one word longer than it is in the original version.
We heated the solution to 90°C for approximately 30 minutes and then allowed it to cool. The active voice is not automatically more concise than the passive.) Does the active voice add clarity?
Perhaps, although the reader may be justified in assuming that the authors are also the performers.
The active voice has changed the focus, however, from the research to the researchers, an emphasis the author may not desire in the Methods section, where the general topic is the research materials and procedures.
When should an author choose the passive voice over the active voice? The passive voice emphasizes the person or object receiving the action (e.g., Samples were analyzed).
The active voice, in contrast, emphasizes the person or object performing the action (e.g., We analyzed samples).