3 Nā laʻana o nā nīnau e pili ana i ka hoʻopili ʻana o ke kānāwai mua o ka thermodynamics i nā kaʻina hana isochoric (ka nui mau)
1. Kiʻi o ke kaomi (P) e kūʻē i ka nui (V) o kahi kinoea e hana ana i kahi kaʻina hana isochoric. ʻO ka hana i hana ʻia e ke kinoea ma ke kaʻina hana AB…
Pahana
Kaʻina Hana AB = kaʻina hana isochoric (ka leo mau). Ma ka leo isochoric, ʻaʻole e loli ka leo o ke kinoea (a me ka leo o ka hakahaka) no laila ʻaʻohe hana e hana ʻia e ke kinoea.
2. ʻEkolu mole o ke kinoea monatomic ma ka mahana o 47oC a me ke kaomi 2 x 105 Ke hana nei ʻo Pascal i kahi kaʻina hana isochoric a hiki i ka piʻi ʻana o ke kaomi i 3 x 105 ʻO Pascal. ʻO ka loli o ka ikehu kūloko o ke kinoea… ʻO ke kūpaʻa kinoea honua (R) = 8,315 J/mol.K
Pahana
Ua ʻike ʻia :
Mahana mua (T1) = 47oC + 273 = 320 K
Kaomi mua (P1) = 2 x 105 Pa
Kaomi hope loa (P2) = 3 x 105 Pa
ʻO ke kūpaʻa kinoea honua (R) = 8,315 J/mol.K
Helu o nā mole (n) = 3
Ua nīnau ʻia Nā loli i ka ikehu i loko o ke kinoea
Pane :
I loko o ke kaʻina hana isochoric, noho mau ka nui no laila ʻaʻohe hana e hana ʻia e ke kinoea (W = 0).
Ke Kānāwai Mua o ka Thermodynamics :
Ma muli o ka loaʻa ʻana o kēia ʻano hana, ua hoʻoholo ʻia ma ke kaʻina hana isochoric, ʻo ka wela i hoʻohui ʻia i ka ʻōnaehana (Q) ke kumu o ka hoʻonui ʻana i ka ikehu kūloko o ka ʻōnaehana (U). I ka ʻaoʻao ʻē aʻe, ʻo ka wela i hoʻokuʻu ʻia e ka ʻōnaehana ke kumu o ka emi ʻana o ka ikehu kūloko o ka ʻōnaehana. ʻEhia ka nui o ka loli o ka ikehu kūloko o ke kinoea? Ua helu ʻia ka loli o ka ikehu kūloko o ke kinoea me ka hoʻohana ʻana i ke ʻano hana ikehu kūloko ma lalo nei.
Ikehu i loko o ke kinoea :
I mea e helu ai i ka loli o ka ikehu kūloko, pono e ʻike ʻia ka mahana hope loa (T).2). E helu iā T2 me ka hoʻohana ʻana i ke ʻano hana kānāwai o Gay-Lussac.
Ke kānāwai o Gay-Lussac (isochoric/constant volume) :
E helu i ka loli o ka ikehu i loko o ke kinoea:
ʻO ka loli o ka ikehu kūloko o ke kinoea he 5986,8 Joules.
3. He 0,2 moles o ke kinoea monatomic ma ka mahana o 27oAia ʻo C i loko o kahi ipu pani. ʻO ka wela e pono e omo ʻia e hoʻonui i ka mahana o ke kinoea i 400 K ʻo ia… Universal gas constant (R) = 8,315 J/mol.K
Pahana
Ua ʻike ʻia :
Helu o nā mole (n) = 0,2 mol
Mahana mua (T1) = 27oC + 273 = 300 K
Mahana hope loa (T2) = 400 K
ʻO ke kūpaʻa kinoea honua (R) = 8,315 J/mol.K
Ua nīnau ʻia : Ka wela i omo ʻia (Q)
Pane :
I loko o ke kaʻina hana isochoric, noho mau ka nui no laila ʻaʻohe hana e hana ʻia e ke kinoea (W = 0).
Ke Kānāwai Mua o ka Thermodynamics :
Ka wela i omo ʻia (Q) = ka piʻi ʻana o ka ikehu kūloko o ke kinoea (U). Ua helu ʻia ka loli o ka ikehu kūloko o ke kinoea me ka hoʻohana ʻana i ke ʻano ikehu kūloko ma lalo nei.
Ikehu i loko o ke kinoea :
Ka wela i omo ʻia e ke kinoea = ka loli o ka ikehu kūloko = 249,45 Joules.
