Dalton's Law of partial pressure states that
a) for every pressure there is an equal and opposite pressure
b) in a mixture of two or more gases each will exert a partial pressure which is equal to the pressure that it would exert if it filled that space alone
c) the pressure exerted by two or more gases on the walls of the containing vessel is equal to a constant
d) the sum of the mass of air and water vapour in a vessel is equal to the total pressure
e) water vapour must be included when calculating air pressures
Answer: B