Abstract: A liquid such as a hydrocarbon fuel is sprayed electrostatically into a gas tream. Spraying is achieved by supplying the liquid to a porous member having a plurality of termini within an electrostatic field. The electrostatic field strength is enhanced at the termini so that liquid which soaks through the porous member to the termini breaks up under the influence of the locally high electrostatic field into a stream of droplets which are repelled by their charge away from the termini. The droplets become finely dispersed in a passing gas stream.The invention finds particular application as an electrostatic carburettor for dispersing petrol into an air stream for combustion in an internal combustion engine. The invention can also be utilized for re-dispersing fuel droplets deposited on the wall of an air/fuel intake.