Nsu (nnuru nsusuwii H2O) yɛ nnuru a ɛnyɛ nkwaboaa, ɛyɛ mmerɛw, ɛnyɛ dɛ, enni hua, na ɛkame ayɛ sɛ enni kɔla, a ɛno ne ade titiriw a ɛwɔ Asase so nsu ne abɔde a nkwa wom a wonim nyinaa mu nsu (a ɛyɛ adwuma sɛ ade a wɔde hyɛ mu[1]) . . Ɛho hia ma nkwa ahorow a wonim nyinaa, ɛwom mpo sɛ ɛmma aduan, ahoɔden, anaasɛ aduannuru nketenkete a ɛwɔ nkwa mu de. Ne nnuru nhyehyɛe, H2O, kyerɛ sɛ ne molecule biara kura oxygen biako ne hydrogen atom abien, a wɔde covalent bonds abɔ mu. Hydrogen atɔm no bata oxygen atom no ho wɔ anim a ɛyɛ 104.45°.[2] "Nsuo" nso yɛ din a wɔde frɛ nsu tebea a ɛwɔ H2O mu wɔ ɔhyew ne nhyɛso a ɛfata mu.