# Standard temperature and pressure are defined as what?

These days it's $273.15$ $K$, and $100 \cdot k P a$ $\text{(1 bar)}$. Depending on the curriculum, and the subject, different definitions pertain. Most older chemists would regret the passing of $1 \cdot a t m$ $= \left(101.3 \cdot k P a\right)$ as a standard.