Vapor Pressure - Relation To Boiling Point of Liquids

Relation To Boiling Point of Liquids

Further information: Boiling point

As a general trend, vapor pressures of liquids at ambient temperatures increase with decreasing boiling points. This is illustrated in the vapor pressure chart (see right) that shows graphs of the vapor pressures versus temperatures for a variety of liquids.

For example, at any given temperature, methyl chloride has the highest vapor pressure of any of the liquids in the chart. It also has the lowest normal boiling point (-24.2 °C), which is where the vapor pressure curve of methyl chloride (the blue line) intersects the horizontal pressure line of one atmosphere (atm) of absolute vapor pressure.

Although the relation between vapor pressure and temperature is non-linear, the chart uses a logarithmic vertical axis to produce slightly curved lines, so one chart can graph many liquids. The vapor pressure of a liquid at its boiling point equals the pressure of its surrounding environment.

Read more about this topic:  Vapor Pressure

Famous quotes containing the words relation to, relation, boiling and/or point:

    “Hesitation increases in relation to risk in equal proportion to age.”
    —Ernest Hemingway (1899–1961)

    “In relation to God, we are like a thief who has burgled the house of a kindly householder and been allowed to keep some of the gold. From the point of view of the lawful owner this gold is a gift; From the point of view of the burglar it is a theft. He must go and give it back. It is the same with our existence. We have stolen a little of God’s being to make it ours. God has made us a gift of it. But we have stolen it. We must return it.”
    —Simone Weil (1909–1943)

    “Unmeasured power, incredible passion, enormous craft: no thought
    apparent but burns darkly
    Smothered with its own smoke in the human brain-vault: no thought
    outside; a certain measure in phenomena:
    The fountains of the boiling stars, the flowers on the foreland, the
    ever-returning roses of dawn.”
    —Robinson Jeffers (1887–1962)

    “No one can doubt the purpose for which the Nation now seeks to use the Democratic Party. It seeks to use it to interpret a change in its own plans and point of view.”
    —Woodrow Wilson (1856–1924)