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properties of petroleum

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Across
3.a measure of the compactness of a substance, expressed as its mass per unit volume.
6.dash, admixture
8.a dark+coloured thick ,flammable ctude oil
9.a colourless odourless relatively unreactive gaseous element that forms 78 per cent (by volume) of the air, occurs in many compounds, and is an essential constituent of proteins and nucleic acids: used in the manufacture of ammonia and other chemicals and as a refrigerant
12.coveing or treating with an oily or greasy substance so as to lessen friction
13.not transmitting light, not transporant
14.the extent to which a fluid resists a tendency to flow
15.an organic compound containing carbon and hydrogen
Down
1.any one of various volatile flammable liquid mixtures of hydrocarbons, mainly hexane, heptane, and octane, obtained from petroleum and used as a solvent and a fuel for internal-combustion engines.
2.sticky; glutinous;
4.to make sth saturated
5.quality
7.the arrangements of various parts of which sth is made up
10.smell
11.n allotropic nonmetallic element, occurring free in volcanic regions and in combined state in gypsum, pyrite, and galena.

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