Question

Under which of the following conditions, can we boil water at room temperature?

• A.
  At low pressure
• B.
  At high pressure
• C.
  At atmospheric pressure
• D.
  At very high pressure

Answer 1

The correct option is A

At low pressure
Pressure and temperature have a reverse effect on phase change.

At atmospheric pressure, water boils at ${100}^{\circ }C$. Now the temperature is reduced to room temperature $\left({25}^{\circ }C\right)$. So, for boiling, either temperature needs to be increased or pressure needs to be decreased.