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Physical & Chemical properties

Vapour pressure

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Description of key information

The vapour pressure of sulphur trioxide varies with the polymeric state of the substance. Thevapour pressure is 97.3 to 577.2 hPa at 25°C depending on the polymeric form.  The vapour pressure of the alpha form is similar to that of the liquid form.

Key value for chemical safety assessment

Vapour pressure:
9 730 Pa
at the temperature of:
298 K

Additional information

The vapour pressure of sulphur trioxide varies with the polymeric state of the substance. Thevapour pressure is 97.3 to 577.2 hPa at 25°C depending on the polymeric form (Merck Index, HSDB).

The vapour pressure of the alpha form is similar to that of the liquid form.

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