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Schedule 2

Original text. Later amendments are not shown.

“An International Standard Atmosphere at sea level” means an atmosphere having the following characteristics—

(a)

the air is a perfect dry gas;

(b)

the physical constants are—

(i)

sea level mean molecular weight:

  • Mo = 28.9644

(ii)

sea level atmospheric pressure:

  • Po = 1013.250 millibars

  • = 1.013250 × 105 newtons m−2

(iii)

sea level temperature:

  • to = 15°C

  • To = 288.15°K

(iv)

sea level atmospheric density:

  • po = 1.2250 kg m−3

(v)

temperature of the ice point:

  • Ti = 273.15°K

(vi)

universal gas constant:

  • R = 8.31432 joules (°K)−1mol−1.