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This document describes the determination of the vapor pressure test of chemicals using dynamic, static, effusion methods - vapor pressure equilibrium, effusion method - Knudsen cell, effusion method - isothermal thermogravimetry, gas saturation method, and rotary method. It is applicable to determining the vapor pressure of solids and liquids ranging from 10^-10 Pa to 10^5 Pa, for samples that do not decompose under the conditions of the test.