Emulsifier bụ ụdị umi nwere ike ime ka ngwakọta nke abụọ ma ọ bụ karịa immiscible components na-etolite a kwụsiri ike emulsion.Ya omume ụkpụrụ bụ na usoro nke emulsion, na-agbasasị agbasasị na-adọ n'ụdị ụmụ irighiri mmiri (microns) gbasasịrị na-aga n'ihu na-adọ, ọ. ebelata interfacial esemokwu nke ọ bụla akụrụngwa na agwakọta usoro, na droplet elu na-etolite a siri ike film ma ọ bụ n'ihi na ụgwọ nke emulsifier e nyere na droplet elu guzobe eletriki okpukpu abụọ oyi akwa, gbochie ụmụ irighiri mmiri ikpokọta ibe ha, na ịnọgide na-enwe edo. Emulsion.Site na echiche nke oge, emulsion ka dị iche iche. Oge a gbasasịrị na emulsion nwere ike ịbụ mmiri mmiri ma ọ bụ mmanụ mmanụ, ọtụtụ n'ime ha bụ mmanụ mmanụ. Usoro na-aga n'ihu nwere ike ịbụ mmanụ ma ọ bụ mmiri, na ọtụtụ n'ime ha. bụ mmiri.Emulsifier bụ surfactant nwere otu hydrophilic na otu lipophilic n'ime molekul. Iji gosipụta hydrophilic ma ọ bụ lipophilic Njirimara nke emulsifier, "hydrophilic lipophilic equilibrium value (HLB value)" na-ejikarị.N'ịbụ nke dị ala nke HLB, ihe na-esiwanye ike nke lipophilic nke emulsifier. N'ụzọ dị iche, ọnụ ahịa HLB dị elu, na-eme ka hydrophilicity dị ike. Ụdị emulsifiers dị iche iche nwere ụkpụrụ HLB dị iche iche.Iji nweta emulsions kwụsiri ike, a ga-ahọrọ emulsifiers kwesịrị ekwesị.