How to distinguish between n-pentane and iso-pentane?

Pentane is an organic compound with the formula C5H12 — that is, an alkane with five carbon atoms. The term may refer to any of three structural isomers, or to a mixture of them: in the IUPAC nomenclature, however, pentane means exclusively the n-pentane isomer; the other two being called 'methylbutane' and 'dimethylpropane'.
Pentanes are components of some fuels and are employed as specialty solvents in the laboratory. Their properties are very similar to those of butanes and hexanes.
Pentane is one of the primary blowing agents used in the production of polystyrene foam.
Because of its low boiling point, low cost, and relative safety, pentane is used as a working medium in geothermal power stations. It is added into some refrigerant blends as well.
Pentanes are relatively inexpensive and are the most volatile alkanes that are liquid at room temperature, so they are often used in the laboratory as solvents that can be conveniently evaporated. However, because of their nonpolarity and lack of functionality, they can only dissolve non-polar and alkyl-rich compounds.
Definitions of n-pentane:
-CAS Number: 109-66-0. A clear, colorless solution with a mild, gasoline-like odor. It is used in natural gas, lighter fluid, blowtorch fuels, and aerosol propellants. Chemical formula = C5H12.
-Pentane also known as amyl hydride or skellysolve is an alkane hydrocarbon with the chemical formula CH3(CH2)3CH3. 3 isomers exist for pentane: n-pentane (linear molecule), isopentane (2-methylbutane) and neopentane which is formally 2,2-dimethylpropane.
efinitions of Isopentane:
Isopentane, also called methylbutane or 2-methylbutane, is an organic chemical compound which is one of the three pentane isomers. Isopentane is a branched-chain alkane with five carbon atoms. Isopentane is an extremely volatile and extremely flammable liquid at room temperature and pressure. The normal boiling point is just a few degrees above room temperature and isopentane will readily boil and evaporate away on a warm day.
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