A major technique by which the boiling point of water among other substances can be increased is by the addition of impurities (like salt).
The boiling point of water can be increased by adding salt to water, you raise the water's boiling point, (the temperature at which it will boil).
More specifically, the temperature needed to boil will increase about 0.5 C for every 58 grams of dissolved salt per kilogram of water. This is an example of boiling point elevation, and this procedure is not exclusive to water.
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