Discussion
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Answer: C
The highest temperature is reached in a valley below sea level.
With the valve open the cooker is simply an open vessel, so water boils at the temperature at which its vapour pressure equals the surrounding pressure. Atmospheric pressure is greatest at the lowest altitude, so the boiling point - and the internal temperature - is highest there.
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