43 In order to obtain the calorific power of gas in Btu(60.5) per cubic foot of gas free of water vapour at a pressure P expressed on the absolute pressure scale and at standard temperature, where the gas has been tested using a method that gives results in Btu(60.5) per cubic foot of gas saturated with water vapour at the pressure P and standard temperature, the results shall be multiplied by a factor equal to
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