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%ما هو (من)٪ 1 - تعريف
Paraffine
·noun A white waxy substance, resembling spermaceti, tasteless and odorless, and obtained from coal tar, wood tar, petroleum, ·etc., by distillation. It is used as an illuminant and lubricant. It is very inert, not being acted upon by most of the strong chemical reagents. It was formerly regarded as a definite compound, but is now known to be a complex mixture of several higher hydrocarbons of the methane or marsh-gas series; hence, by extension, any substance, whether solid, liquid, or gaseous, of the same chemical series; thus coal gas and kerosene consist largely of paraffins.
Paraffine. v
To coat or saturate with paraffine wax. Paper may be paraffined by
dipping in the wax, or by being sprinkled with fragments of wax,
subsequently melted in with a hot iron or otherwise. The tops of battery
carbons are often paraffined to prevent the acid from rising in the
pores by capillary attraction and rusting the connections.
Paraffine Wax
A hydro-carbon composed principally of mixtures of the higher members of
the paraffine series C n H2 n + 2. It is made from cannel coal, coal
tar, or petroleum by distillation. It is an insulator. Its resistance at
46° C. (114.8° F.) per centimeter cube is 3.4E16 ohms, or about
the
highest resistance known.
Its specific inductive capacity (for milky wax) is 2.47 (Schiller). For
clear wax it is given as follows by different authorities:
1.92 Ayrton.
1.96 Wüllner.
1.977 Gibson & Barclay.
2.32 Baltzmann.
It is extensively used in condensers and other electric apparatus as a
dielectric and insulator.
