You can obtain the boiling point of water at different pressures using a table, such as the "Boiling Points of Water at Various Pressures" in the CRC Handbook, or with a Javascript boiling point calculator from the Internet.
In the calculator linked below, you have to enter the pressure in units of inches of Hg. When you hit "Calculate" it returns the temperature in °F and °C and the pressure in millibars.
1 atm = 1.01325 bar
1 bar = 0.986923 atm
1 atm = 760 mm Hg = 29.92126 in Hg
Convert 1 bar to inches of mercury and plug that value into the calculator to get the boiling point at 1 bar pressure. It's not much lower!
Steve
Water Base Boiling Point Calculator
http://www.csgnetwork.com/h2oboil2calc.html/(The calculator program assumes 1 atm = 29.92 in Hg instead of a more accurate 29.92126 in Hg. At 29.92126 in Hg, it gives the boiling point of water as 100.001°C instead of 100°C, a small error.)
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