Boiling point of a liquid depends strongly and directly on the Pressure above the liquid. If the pressure above the liquid is increased, then the boiling point of that substance increases as well and you have to apply more heat to vaporize that liquid.
Let's take and example of water. Water at ground level (1 atm) boils at 100 degree C. If you take this above ground (let's say on a mountain), where the pressure is low, the boiling point would decrease below 100 degree C. Going above in the atmosphere decreases pressure and going down the surface increases the surrounding pressure.
Let's take and example of water. Water at ground level (1 atm) boils at 100 degree C. If you take this above ground (let's say on a mountain), where the pressure is low, the boiling point would decrease below 100 degree C. Going above in the atmosphere decreases pressure and going down the surface increases the surrounding pressure.
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