This standard specifies the calculation method of relative humidity in environmental tests. This standard is applicable to the calculation of relative humidity when measuring the wet and dry bulb temperature with spherical or columnar mercury thermometers in environmental tests.
GB/T 6999-2010 history
2010GB/T 6999-2010 Relative humidity tables for environmental test
1986GB/T 6999-1986 Relative humidity tables for environmental test