standard temperature and pressure
- noun the standard conditions used as the basis for comparing thwe proeties of gases.
- A temperature of 0 °C, and a pressure of 1 atmosphere. Used, for instance, as a practical and easily maintained condition for laboratory experimentation.
- An established combination of temperature and pressure, such as of 25 °C and 1 atmosphere, utilized for any given setting or purpose.
- synonymstandard conditions