Why is butene gas at room temperature

Butane is a gas at room temperature and pressure, but the butane found in some cigarette lighters is a liquid. How can this be?

Vapor Pressure:

The vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid phase in a closed system at constant temperature. It is also an indication of the tendency of a gas to escape from liquid phase. For example, a substance with a high vapor pressure at normal temperatures is a volatile substance (high tendency to become vapor). If the pressure in a closed system is higher than the vapor pressure of a substance at the given temperature, then the substance will be "compressed" to liquid state.

Explanation:

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8