the normal boiling point of any substance would occur at sea level.
the normal boiling point of any substance would occur at sea level.
the normal boiling point of any substance would occur at?
sea level
the normal boiling point (also called the atmospheric boiling point or the atmospheric pressure boiling point) of a liquid is the special case in which the vapor pressure of the liquid equals the defined atmospheric pressure at sea level, 1 atmosphere. at that temperature, the vapor pressure of the liquid becomes sufficient to overcome atmospheric pressure and allow bubbles of vapor to form inside the bulk of the liquid. the standard boiling point has been defined by iupac since 1982 as the temperature at which boiling occurs under a pressure of 1 bar.
boiling point
as can be seen from the above plot of the logarithm of the vapor pressure vs. the temperature for any given pure chemical compound, its normal boiling point can serve as an indication of that compound's overall volatility. a given pure compound has only one normal boiling point, if any, and a compound's normal boiling point and melting point can serve as characteristic physical properties for that compound, listed in reference books. the higher a compound's normal boiling point, the less volatile that compound is overall, and conversely, the lower a compound's normal boiling point, the more volatile that compound is overall. some compounds decompose at higher temperatures before reaching their normal boiling point, or sometimes even their melting point. for a stable compound, the boiling point ranges from its triple point to its critical point, depending on the external pressure. beyond its triple point, a compound's normal boiling point, if any, is higher than its melting point. beyond the critical point, a compound's liquid and vapor phases merge into one phase, which may be called a superheated gas. at any given temperature, if a compound's normal boiling point is lower, then that compound will generally exist as a gas at atmospheric external pressure. if the compound's normal boiling point is higher, then that compound can exist as a liquid or solid at that given temperature at atmospheric external pressure, and will so exist in equilibrium with its vapor (if volatile) if its vapors are contained. if a compound's vapors are not contained, then some volatile compounds can eventually evaporate away in spite of their higher boiling points.
boiling point