Ukushisa okukhethekile

Ukushisa okuqondile (c) inani lokushisa (Q) elidingekayo ukuphakamisa izinga lokushisa (T) leyunithi eyodwa yesisindo (m) sento ngezinga elilodwa. Ifomula ka-c ithi:

Uhlelo Lwamazwe Ngamazwe Lwamayunithi ngu-J/Kg K.

Ukushisa okuthile kwento kuyashintsha ngokushisa. Uma ushintsho lokushisa lungelukhulu kakhulu, inani lingabhekwa njengelihlala njalo. Okulandelayo amanani ka-c ezintweni eziningana ngokucindezela okungu-1 atm kanye nokushisa okungu-20 ^° C (okutholakale ngokuhlola).

Ukushisa okuthile kwento kubonisa ikhono layo lokumunca noma ukukhulula ukushisa. Uma ukushisa okuthile kuphakeme, ikhono lento lokumunca noma ukukhulula ukushisa liyancipha. Uma ukushisa okuthile kuphansi, ikhono lento lokumunca noma ukukhulula ukushisa liba ngcono. Igolide linokushisa okuncane, ngakho limunca noma likhulula ukushisa ngokushesha. Ngokuphambene nalokho, amanzi anokushisa okuphezulu, ngakho-ke amunca noma akhulula ukushisa kancane.

Isibonelo sezinkinga

1. Ukushisa okudingekayo ukuphakamisa izinga lokushisa elingu-1 kg loketshezi olune-c 300 J/Kg.K kusuka ku-20^oU-C uba ngu-30^oU-C u….
Ingxoxo
I-Diketahui :
Kubuziwe : ukushisa (Q)
Jawab :
Ifomula yokushisa :
Amakhalori adingekayo yilawa:
Q = (1)(300)(10)
Q = 3000 amaJoule

2. Uketshezi olunesisindo esingu-2 kg lufudunyezwa kusukela ekushiseni okungu-20^oU-C uba ngu-80^oC, idinga ukushisa okungu-6 × 10⁵ I-Joule. Ukushisa okukhethekile koketshezi…
Ingxoxo
I-Diketahui :
Kubuziwe : vs
Jawab :
Ifomula:
I-c enkulu:
c = 600.000 / (2)(60) = 600.000 / 120
c = 5000 J/Kg. K