Some useful information of important substances

                                  Densities of solid and liquid 
         

Solid	Density	Liquid	Density
Cork	0.2 to 0.3	Water (at 4◦C)	1.00
Glass	2.4 to 2.6	Milk	1.85
Marble	2.5 to 2.8	Kerosene oil	0.81
Iron	7.2	Petrol	0.7—0.8
Gold	19.2	Turpentine oil	0.87
Ice	0.92	Glycerin	1.26
Nickel	8.9	Benzene	0.85
Tin	7.3	Sulphuric acid	1.3
Brass	8.1 to 8.5	Mercury (at 0◦C)8	13.6
Aluminium	2.7	Sea water	1.03—1.05
Lead	11.3	Ethanol	0.81
Silver	10.5
Copper	9.2
Pinewood	0.4—0.7
Oakwood	0.6—0.9
Balsawood	0.15
Ice at 0◦C	0.92

                 Approximate Co—Efficient of sliding friction

Objective (Dry  surface)	Co—efficient of friction
Between wood and wood	0.25—0.5
Between wood and stone	0.4
Between metal and metal	0.2
Between wood and leather	0.4
Between ice and ice	0.028
Rubber tyres on hard road	0.5—0.7

               Specific Heat Capacity of Some Substances

Substance	Jol per K per kg	Substance	Jol per K per kg
Water	4200	Copper	385
Ethanol	2500	Aluminium	913
Turpentine oil	1760	Lead	126
Hydrogen	14300	Iron	106
Air	993	Steel	420
Helium	5240	Granite	820
Oxygen	913	Marble	900
Carbon dioxide	1000	Concrete	3350

Latent heat of fusion of some substance

Substance	Jol per g per K
Water	3350
Aluminium	390
Iron	270
Copper	210
Mercury	1.3

Latent heat of vapourization of some substance

Substance	Jol per g per K
Water	2260
Ethanol	850
Ether	350
Turpentine	270