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Vapour pressure

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Description of key information

The vapour pressure is 1.87E-4 Pa at 25 °C.

Key value for chemical safety assessment

Additional information

The key value for vapour pressure is estimated by using a category approach based on the available data the main constituents, C14 Myristic acid (CAS 544-63-8), C16 Palmitic acid (CAS 57-10-3) and C18 Stearic acid (CAS 57-11-4). C14 Myristic acid had the highest vapour pressure of these constituents (see explanation below). In addition an experimental value for Fatty acids, C16-22 was available, however, was not respected due to its value well above the actual vapour pressure (vapour pressure < 1 Pa).

According to the theoretical principle of Raoult’s law, the vapour pressure of a mixture is equal to the mole-fraction-weighted sum of the components' vapour pressures:

ptot= ∑ pixi

The vapour pressure of the mixture should be lower than the vapour pressure of the component which has the highest vapour pressure in its pure form (C14).

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