Daily Question, May 1, 2016: A liquid begins to boil when its vapor pressure equals the external pressure; the temperature at this point is called

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Boiling begins when the vapor pressure of a liquid equals the external pressure; the temperature at this point is called ( ). A. Dew point B. Bubble point C. Boiling point. Promotion for petrochemical-related activities: ☛ Notice regarding the large-scale event “I’m saving energy, where are you?” in the petrochemical sector: http://bbs.hcbbs.com/thread-1579199-1-1.html (Source: Haichuan Chemical Forum). This event offers awards in both text and image categories. When there are over 200 entries, an additional grand prize will be awarded, worth 600 Haichuan coins; if there are more than 300 entries, the grand prize value increases to 1,000 Haichuan coins, and if there are 500 entries, it rises to 1,500 Haichuan coins. First prize: 3 Haichuan commemorative water cups. Second prize: 5 winners, each receiving 120 Haichuan coins. Honorable mentions: several winners, each receiving 200 wealth points. --------------------------------------------------------------------------------------------------------- ☛ “My Equipment, My Home” – Photo competition (10 wealth points per photo): http://bbs.hcbbs.com/thread-1495069-1-1.html (Source: Haichuan Chemical Forum). --------------------------------------------------------------- ☛ Haichuan Freelancers’ large-scale “public welfare” event is now underway! http://bbs.hcbbs.com/thread-1576975-1-1.html (Source: Haichuan Chemical Forum) Looking forward to your participation