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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, one atmosphere.
Oct 4, 2024 · The boiling point of a liquid varies according to the applied pressure; the normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F). At higher altitudes the temperature of the boiling point is ...
- The Editors of Encyclopaedia Britannica
Sep 9, 2019 · Normal boiling point is the temperature at which a liquid boils at 1 atmosphere of pressure. It's different from the simple definition of boiling point in that the pressure is defined. The normal boiling point is a more useful value when comparing different liquids, since boiling is affected by altitude and pressure.
- Anne Marie Helmenstine, Ph.D.
- Difference Between Boiling and Evaporation
- Factors That Affect Boiling Point
- Normal Boiling Point vs Standard Boiling Point
- Boiling Points of The Elements
- References
In both boiling and evaporation, a liquid transitions into a vapor. The difference is that all of the liquid starts changing into a vapor at the boiling point. The bubbles you seeforming within a boiling liquid are this vapor. In evaporation, in contrast, only liquid molecules at the surface escape as vapor. This is because there isn’t enough liqui...
The boiling point is not a constant value for a substance. The main factor it depends on is pressure. For example, you see high-altitude cooking directions on recipes because water boils at a lower temperature at a higher altitude, where atmospheric pressure is lower. If you drop the pressure to a partial vacuum, water boils at room temperature. An...
The two main types of boiling points are the normal boiling point and the standard boiling point. The normal boiling point or the atmospheric boiling point is the boiling point at 1 atmosphere of pressure or sea level. The standard boiling point, as defined by the IUPAC in 1982, is the temperature at which boiling occurs when the pressure is 1 bar....
This periodic table shows the normal boiling point values of the chemical elements. Heliumis the element with the lowest boiling point (4.222 K, −268.928 °C, −452.070 °F). Rhenium (5903 K, 5630 °C, 10,170 °F) and tungsten (6203 K, 5930 °C, 10706 °F) have extremely high boiling points. The exact conditions determine which of these two elements ha...
Cox, J. D. (1982). “Notation for states and processes, significance of the word standard in chemical thermodynamics, and remarks on commonly tabulated forms of thermodynamic functions”. Pure and Ap...DeVoe, Howard (2000). Thermodynamics and Chemistry(1st ed.). Prentice-Hall. ISBN 0-02-328741-1.Goldberg, David E. (1988). 3,000 Solved Problems in Chemistry(1st ed.). McGraw-Hill. ISBN 0-07-023684-4.Perry, R.H.; Green, D.W., eds. (1997). Perry’s Chemical Engineers’ Handbook(7th ed.). McGraw-Hill. ISBN 0-07-049841-5.Aug 6, 2020 · The normal boiling point of water is 100 °C or 212 °F. Changes in elevation affect boiling point because they affect atmospheric pressure. The normal boiling point of water is 100 °C, 212 °F, or 373.1 K. The “normal” refers to sea level or an elevation of 0 meters or feet. But, the boiling point of water changes with elevation.
Jul 15, 2023 · Normally when we boil a liquid, we do so at atmospheric pressure. If this pressure is the standard pressure of 1 atm (101.3 kPa), then the temperature at which the liquid boils is referred to as its normal boiling point. This is the boiling point which is usually quoted in chemical literature. Not everyone lives at sea level, though.
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A compound's "normal boiling point" refers to its boiling point at a pressure of 760 mmHg 760 mm Hg. A compound's boiling point is a physical constant just like melting point, and so can be used to support the identification of a compound. Unlike melting points however, boiling points are not generally used as a gauge of purity.
