Does water boil quicker at a higher atmospheric pressure, or a lower on?

Lower pressure.

Water boils at a lower temperature at say Denver (about 203 degrees F.) than at sea level. Changes is atmosheric pressure at any altitude will cause slight variations in the boiling point.

Also, automobiles that are driven at higher altitudes require re-jetting of the carburettor or program adjustments in fuel injected models to operate properly.

The main principle at work here is the ever popular PV=nRT.

Pressure*Volume=number of moles*gas constant*Temperature. So, the same amount of moles of water at a lower pressure will consequently have a lower boiling point. The higher you go, the less pressure, and the lower the boiling temperature.

So yes, it will take less time to get the water to this lower temperature, and it will boil faster.

If you climb a mountain, the air pressure falls and you find that water boils at a lower temperature. In extreme altitudes the change can be quite pronounced.

At 10 000 ft - the altitude of many ski resorts - water boils at about 90C or 190F. There's a calculator on the link.

hth

yes it boils at a lower temperature as answered above. If you are cooking at altitude you may need a pressure cooker to get the same results you did at home.

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Yes