Pronunciation: [bˈɔ͡ɪl ˈɒf] (IPA) 
The word "boil off" is spelled with two syllables. The first syllable is pronounced as /bɔɪl/ which rhymes with "coil" and is spelled with a "b," "o," "i," and "l." The second syllable is pronounced as /ɒf/ which rhymes with "golf" and is spelled with an "o" and an "f." This term means the process of converting a liquid into a gas by boiling. For example, when water is boiled, it boils off and turns into steam.
Boil off refers to the process of vaporization or evaporation that occurs when a liquid reaches its boiling point and converts into gas or vapor. This phenomenon typically takes place when a substance is heated to a temperature at which its vapor pressure equals or exceeds the atmospheric pressure surrounding it. As a result, the molecules within the liquid gain enough energy to overcome the intermolecular forces binding them together, causing them to escape from the liquid phase.
Boil off is commonly associated with substances such as water, where heating it to its boiling point of 100 degrees Celsius (212 degrees Fahrenheit) at standard atmospheric pressure (1 bar or 101.3 kilopascals) causes it to transform into steam. Other liquids, such as alcohol, also boil off when heated to their respective boiling points.
In certain contexts, boil off can also refer to the loss of liquid due to evaporation, particularly in storage or transportation systems. For example, in the liquefied natural gas (LNG) industry, boil off refers to the vaporization of LNG that occurs during storage and transportation, requiring specific measures to prevent or manage the loss. Similarly, the term can be applied to cryogenic systems where the result of heat influx causes liquefied gases to boil off and convert into gas.
The etymology of the term "boil off" can be understood by breaking it down into two parts: "boil" and "off".
The word "boil" originated from the Old English word "bȳlian" or "bȳle", which meant "to seethe" or "to cook by boiling". The term has roots in Proto-Germanic and Proto-Indo-European languages. Over time, the word evolved and gained the specific meaning of the process of heating a liquid until it reaches its boiling point and begins to vaporize.
The word "off" is an adverbial particle that originated from the Old English word "of" or "off". It has roots in Proto-Germanic and Proto-Indo-European languages and carries the meaning of separation or motion away from a place or state.
