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This European Standard specifies a method for the determination of the total pressure, exerted in vacuo, by volatile, low viscosity petroleum products, components, and feedstocks containing air. An equivalent dry vapour pressure can be calculated from the air containing vapour pressure (ASVP) measurement. The conditions used in the test described in this standard are a vapour-to-liquid ratio of 4:1, a sample size of 1 l, and a test temperature of 37,8 °C. NOTE 1 See annex A for information on the precision values when using 50 ml samples or using a test temperature of 50,0 °C. The equipment is not wetted with water during the test, and the method described is therefore suitable for testing samples with or without oxygenates; no account is taken of dissolved water in the sample. This method described is suitable for testing air-saturated samples that exert an air saturated vapour pressure of between 9,0 kPa and 150,0 kPa at 37,8 °C. This European Standard is applicable to fuels containing oxygenated compounds up to the limits stated in the relevant EC Directive3). NOTE 2: For the purposes of this European Standard, the term "% ( V/V)" is used to represent the volume fraction. WARNING The use of this standard can involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use. 3) EC Directive 85/536/EEC, Council Directive on crude-oil savings through the use of substitute fuel components in petrol.