nmol per litre converted to ppb for a gas

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nmol per litre converted to ppb for a gas

Postby Guest » Sun Feb 05, 2006 10:50 pm

Hello there I am trying to convert ozone measurements and want ppb but I have nmol per litre.

Postby Guest » Mon Feb 06, 2006 3:20 am

ppb is ambiguous because it can be by weight fraction, volume fraction, or mole fraction (the last two are the same for a gas).

As a molar fraction, ppb would be, for example nmol/mol. The ozone is already measured in nmol. Whatever the dilutant gas is, air or something else, the volume occupied by a mole can be calculated by ideal gas law if you know temperature and pressure. At STP, 1 mol occupies 22.4 L. Therefore your liters of gas, at known temperature and pressure, can be converted to moles.

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