Answer:
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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