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Vapour pressure

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Description of key information

The vapour pressure of ammonia, anhydrous is reported to be 8611 hPa at 20 °C (Handbook of Compressed Gases).

Key value for chemical safety assessment

at the temperature of:
293 K

Additional information

The vapour pressure of ammonia, anhydrous is reported to be 8611 hPa at 20 °C (Handbook of Compressed Gases; Lange's Handbook of Chemistry).

The vapour pressure of aqueous ammonia was determined to be 2160 mmHg at 25 °C (Daubert & Danner, 1989). The vapour pressure of a 30% ammonia solution (aqueous) is reported to be 118 torr at 20°C (Young, 2003). At a temperature of 19.9°C, the vapour pressure varies between 9.64 -41.69 kPa for a composition of 3.93 to 23.37%wt NH3 in solution (Perman, 1903).