Is eard ata i gceist leis an aerasol sa chiall eolaioch na cineal meascan colloideach ina bhfuil caithnini beaga soladacha no deora beaga leachta scaipthe ar fud an ghais no an aeir. Is minic a shiltear gurb ionann aerasol agus abhar spraeailte, ach san eolaiocht is coincheap i bhfad nios cuimsithi e: mar shampla, glactar leis na scamaill mar cineal aerasol, os rud e gur deora beaga uisce ata ann agus iad scaipthe san aer.
Bhiodh clorafluaracarboin (CFCanna) in usaid le fada mar iomproir an abhair le deascadh is e faoi bhru i spraechanna, ach ta deireadh curtha leis an usaid seo de bharr an dochair don chiseal ozoin . [1]