Question

If the pressure is reduced from the atmospheric pressure to a lower pressure, water will boil at a temperature ____.

• A. $<100{}^{\circ }\text{C}$
• B. $>100{}^{\circ }\text{C}$
• C. $=100{}^{\circ }\text{C}$
• D. Data insufficient

Answer 1

The correct option is A $<100{}^{\circ }\text{C}$

At atmospheric pressure ($1\text{atm}$), water boils at $100{}^{\circ }\text{C}$. When pressure is reduced, liquids tend to boil at a temperature lower than their actual boiling point. So, water boils at a temperature lower than $100{}^{\circ }\text{C}$, when the surrounding pressure is reduced than $1\text{atm}$.