1.1本试验方法描述了一种通过在不同施加压力下使用差热分析（DTA）或差示扫描量热法（DSC）仪器进行的沸点测量来测定纯液体或熔体蒸汽压的程序。 1.2本试验方法可用于273至773 K（0至500°C）的温度范围和5 kPa至2 MPa的压力。这些范围可能因使用的仪器和测试材料的热稳定性而异。由于本试验方法要求施加一定范围的压力，因此最好使用称为高压差热仪器（HPDSC或HPDTA）的仪器。 1.3也可使用与本试验方法等效的计算机或电子仪器、技术或数据处理。 注1-明确建议本试验方法的用户，所有此类仪器或技术可能不是等效的。 本试验方法的使用者有责任在使用前确定必要的等效性。只有手动程序才被视为有效。 1.4国际单位制数值单位为标准。括号中给出的常用单位仅供参考。 1.5没有与本试验方法等效的ISO标准。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 蒸汽压是液体的基本热物理性质。蒸汽压数据在工艺设计和控制、建立安全搬运和运输的环境法规、估计挥发性有机物含量（VOC）和得出危险评估中非常有用。材料安全数据表（MSDS）需要蒸汽压和沸腾温度数据。 蒸发焓也可以根据蒸气压曲线的斜率估算（见实施规程E 2071 ).

1.1 This test method describes a procedure for the determination of the vapor pressure of pure liquids or melts from boiling point measurements made using differential thermal analysis (DTA) or differential scanning calorimetry (DSC) instrumentation operated at different applied pressures. 1.2 This test method may be used for the temperature range 273 to 773 K (0 to 500 °C) and for pressures between 5 kPa to 2 MPa. These ranges may differ depending upon the instrumentation used and the thermal stability of materials tested. Because a range of applied pressures is required by this test method, the analyst is best served by use of instrumentation referred to as high pressure differential thermal instrumentation (HPDSC or HPDTA). 1.3 Computer or electronic-based instruments, techniques, or data treatment equivalent to this test method may also be used. Note 1—Users of this test method are expressly advised that all such instruments or techniques may not be equivalent. It is the responsibility of the user of this test method to determine the necessary equivalency prior to use. Only the manual procedures are to be considered valid. 1.4 SI value units are the standard. The customary units given in parentheses are for information only. 1.5 There is no ISO standard equivalent to this test method. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Vapor pressure is a fundamental thermophysical property of a liquid. Vapor pressure data are useful in process design and control, in establishing environmental regulations for safe handling and transport, for estimation of volatile organic content (VOC), and in deriving hazard assessments. Vapor pressure and boiling temperature data are required for Material Safety Data Sheets (MSDS). The enthalpy of vaporization may also be estimated from the slope of the vapor pressure curve (See Practice E 2071 ).