(physics, chemistry) An electrode with a standard electrode potential of zero; used as a standard against which other electrodes are measured.

an electrode potential measured under standard conditions; a temperature or 298K, 1 atmosphere pressure and at 1 mole of the activity of redox participants of the half-reaction.

(physics, chemistry) The international, standard conditions used to aid reproducibility; a temperature of 0 °C (273.15 K) and a pressure of 1 atmosphere (101.325 kPa). Abbreviated as STP.

The time zone that encompasses the segment of the United States that includes the Rocky Mountains.

The time of day in the time zone that encompasses the west coast of the United States.

The time of day in the time zone that encompasses a central portion of the United States.

The timezone that encompasses the East coast of the United States, and parts of Canada during winter and late autumn; it is five hours behind Greenwich Mean Time.

(medicine) The incidence rate of a particular disease in a population if that population had a standard age structure.

plural of standard hydrogen electrode

the time of day in the time zone that encompasses most of Alaska.