Normal or room temperature — the ambient temperature when something is not heated or refrigerated.
この薬は常温で保存してください。
Please store this medicine at room temperature.
牛乳は開封後、常温で長時間放置しないでください。
Do not leave milk at room temperature for a long time after opening.
このお菓子は常温でも問題なく持ち運べます。
You can carry these snacks at room temperature without any problem.
A constant or fixed temperature; used to indicate maintaining or performing something at a set ambient temperature (common in experiments or manufacturing).
試験は常温下で24時間行った。
The test was conducted for 24 hours at constant (room) temperature.
この材料は常温での安定性が高い。
This material has high stability at constant/room temperature.