جدول گرمای نهان ذوب برخی مواد

 جدول گرمای نهان ذوب برخی مواد

 

Product	Latent Heat of Melting
	(kJ/kg)	(Btu/lbm)
Acetic acid	181	77.8
Acetone	98.3	42.3
Alcohol, ethyl (ethanol)	108	46.4
Alcohol, methyl (methanol)	98.8	42.5
Alcohol, propyl	86.5	37.2
Aluminum	321	138.2
Ammonia	339	146
Aniline	113.5	48.8
Antimony	164	70.5
Benzene	126	54.2
Bismuth	52.9	22.7
Brass	168	72.2
Bromine	66.7	28.7
Cadmium	46	19.8
Carbon disulfide	57.6	24.8
Carbon dioxide	184	79
Carbon tetrachloride	174	74.8
Cast iron	126	54.2
Chloroform	77	33.1
Chromium	134	57.6
Cobalt	243	104.5
Copper	207	89
Decane	201	86.4
Dodecane	216	92.8
Ether	96.2	41.4
Ethyl ether	113	48.6
Ethylene glycol	181	77.8
Glycerine	200	75.6
Gold	67	28.8
Heptane	140	60.2
Hexane	152	65.3
Ice, see Water
Iodine	62.2	26.7
Iron, gray cast	96	41.4
Iron, white cast	138	59.4
Iron, slag	209	90.0
Lead	22.4	9.65
Manganese	155	66.6
Mercury	11.6	5.08
Naphthaline	151	64.9
Nickel	297	127.7
Octane	181	77.8
Paraffin	147	63.2
Phenol	121	52
Phosphrus	21.1	9.1
Platinium	113	48.6
Potassium	59	25.4
Propane	79.9	34.3
Propylene	71.4	30.7
Silver	88.0	37.9
Sulphur	39.2	16.87
Tin	58.5	25.2
Toluene	71.8	30.9
Water, Ice	334	144
Wood's alloy	33.5	14.4
Zinc	118	5.63

• 1 kJ/kg = 0.4299 Btu/lb_m = 0.23884 kcal/kg

Heat Required to Melt a Solid

The heat required to melt a solid can be calculated as

q = L_m m  (1)

where 

q = required heat (J, Btu)

L_m = latent heat of melting (J/kg, Btu/lb)

m = mass of subsance (kg, lb)

Example - Required Heat to melt Ice (Water)

The heat required to melt 10 kg of water can be calculated as

q = L_m m

  = 334 10³ (J/kg) 10 (kg)

  = 3340000 (J)

  = 3340 (kJ)