Pentane 109-66-0

Isopentane,  C₅ H₁₂ , also called methylbutane or 2-methylbutane, 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. Isopentane is commonly used in conjunction with  liquid nitrogen  to achieve a liquid bath temperature of -160 °C. It is 1% or less of natural gas.