and the like amphoteric emulsifiers include the sodium salt of n coco beta aminopropionate n coco beta aminopropionic acid disodium n lauryl beta iminodipropionate dicarboxylic coconut derivative diethanolamine salt dicarboxylic palmitic derivative sodium salt c cetyl betaine and n lauryl betaine fluorine containing surfactants of all types are useful whether ionic or nonionic among the anionic types may be mentioned ammonium perfluoroalkyl sulfonates potassium perfluoroalkyl sulfonates potassium fluorinated alkyl carboxylates and ammonium perfluoro alkyl carboxylates the fluorinated alkyl esters are examples of nonionic types the foregoing and other fluorine containing surfactants are commercially available such as surfactants fc 93 fc 95 fc 128 fc 143 fc 430 and f 431 sold by 3m company naturally occurring emulsifiers or derivatives thereof are also useful these include the alginates cellulose derivatives such as methyl cellulose and carboxymethyl cellulose water soluble gums such as gum arabic and gum tragacanth the phospholipids such as lecithin and the sterols preferred emulsifying agents are the nonionic emulsifiers pluronic trademark f 68 and pluronic f 108 and yolk phospholipid the pluronic emulsifiers are polyoxyethylenes and polyoxpropylenes available from wyandotte basf typically the emulsifier whether nonionic or ionic is used in an amount up to about 10 wt of the total emulsion composition or up to about 5 wt based on the water used to form the emulsion greater amounts can be used if desired the emulsifiers can be used singly or in combination provided they are ionically compatible the amounts and proportions of inert organic gas transporting liquid water and emulsifying agent used to form the emulsion and gel can vary over a wide range generally the amounts of each ingredient will be such as to form.