After studying the government's ledgers, the collector discovered that the three per cents had appreciated in market value due to falling interest rates.

By invoking obscurum per obscurius in his paper, the researcher ended up making the concept even less accessible to readers.

The engineer specified foot per second as the unit to record the object's velocity during testing.

The wind gusts reached thirty feet per second during the storm.

When listing unpublished sources, many journals accept the notation pers. comm. to denote information obtained directly from colleagues.

The lab stored several peracetates in labeled amber bottles to prevent decomposition.

In the lab, we handled several peracids with extreme care due to their strong oxidizing properties.

The peracidic solution oxidized the sulfide more rapidly than the neutral reagent.

She called the storm-tossed voyage per'lous, yet resolved to press on.

After years of advocacy, the peracephalus finally had access to specialized medical care and community support.