Effective temperature

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effective temperature

  1. The temperature at which motionless saturated air would induce, in a sedentary worker wearing ordinary indoor clothing, the same sensation of comfort as that induced by the actual conditions of temperature, humidity, and air movement. Effective temperature is used as a guide in air-conditioning practice, and, on the comfort chart (American Society of Heating and Air Conditioning Engineers), it appears as a family of curves that serves as one coordinate in defining comfort zones.

  2. In phenology, the temperature at which plants, especially cereals, begin to grow; generally about 0°C (32°F), for example, winter wheat, to 7°–10°C (45°–50°F), for example, maize.

  3. With respect to radiation, the blackbody temperature that would yield the same amount of radiation as that emitted.

    The effective temperature of the earth as a whole is about 254 K, corresponding to an average emittance of 236 W m-2.