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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:

M0

  • 28.9644

    • (ii)

    sea level atmospheric pressure:

    P0= 1013.250 millibars
    = 1.013250 × 105 newtons−2
    (iii)

    sea level temperature:

    • t0 = 15°C

    • T0 = 288.15°K

    (iv)

    sea level atmospheric density:

    • P0 = 1.2250 kg m−3

    (v)

    temperature of the ice point:

    • Ti = 273.15°K

    (vi)

    universal gas constant:

    • R = 8.31432 joules (°K)−1 mol−1