### The normal boiling point of a liquid is defined as

The normal boiling point of a liquid is defined as

• A. the temperature at which its vapour pressure equals the atmospheric pressure
• B. the temperature at which bubbles begin to form
• C. the temperature at which the vapour pressure equals 1 temperature
• D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
• E. the temperature at which the space above the liquid is saturated
##### Explanation

The normal boiling point is the temperature at which the vapour pressure is equal to the standard sea-level atmospheric pressure which is 760 mm [29.92 inches] of mercury.

#### Contributions (21)

*The boiling point of a liquid is the temperature at which its saturated vapour pressure equates the pressure of the external air around it.

*The normal boiling point of a liquid is the temperature at which its vapour pressure is equal to 1atm.

Reference: https://www.chem.purdue.edu/gchelp/liquids/boil.html

Difference between boiling point and normal boiling point.

*Sometimes, the pressure of the air surrounding the liquid being heated can be greater or less (eg the pressure in a vacuum is less than the atmospheric pressure) than the atmospheric pressure, so the temperature at which the vapour pressure of the liquid equals the pressure of the air around it is the BOILING POINT.

*But if the liquid is being heated under normal atmospheric pressure, then the temperature at which the vapour pressure of the liquid equals the atmospheric pressure (which was defined by IUPAC to be 1atm or 760torr,760mmHg,101325pascal,101325N/m2) is the NORMAL BOILING POINT of the liquid.

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• Samuel Benson: Dusisamuel your explanation implies option A
3 years ago
• nebechi: Yes it really does
2 years ago
exactly vapour pressure equalling atmospheric pressure at nomal
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that's right
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there is difference between boiling point and normal boiling point of a liquid cos i knw dat normal boiling point of a liquid is the temperature at which the liquid boils at 1 atmosphere of pressure...had to do a lot of research...i will refer u to d web
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N.b; at 100% humidity vapour pressure is said to be saturated which is equal to the atmospheric pressure.
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Boiling point is wen d atmospheric pressure equals d saturated vapour pressure...tanx
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• cyberformz: Boilin pnt of a liquid z d pnt wia d saturated vapour presure = d external atmospheric presure nd dis cn b provin experimntally usin a J-shaped Tube insertted in a beaker containin water,thermometre nd stirer. D liquid z introduced in d J-shaped tube usin a bent pipette nd Hg z added before addin d liquid . D short arm of d j-shaped z sealed while long arm of d J-shaped z exposed to d atmosphere . D liquid z heated nd stired to ensure even heat distributn . D pnt wia d liquid in both arms er equal d liquid z seen to boil showin dt d S.V.P = d external atmospheric pressure
4 years ago
wake me from sleep I will still tell u its A
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• mralz: Same here jare
6 years ago
Nobody wont knw dat d ans is A
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The temperature at which the vapor pressure is equal to the atmospheric pressure above the liquid is called the boiling point.
So, I'll go for A
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A is the answer bcoz the normal boiling point of a liquid occurs when the temperature is equal to the atmospheric pressure check your text book
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option A is the answer because the boiling point of a liquid is a stage @ which the vapour pressure is equal to the atmospheric pressure (1atm)
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i love this ans. Because it remain unchange...
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The question is wrongly composed:

the correct answer is A. the one you provided as the correct answer is a definition for SATURATION POINT
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