You can increase boiling points of any liquid by applying,i e putting it in a pressure cooker.
When you place some food in a pressure cooker it is cooked by the water without causing the water to boil. Even though the heat is sufficient to boil the water at atmospheric pressure. So by applying pressure above the atmospheric pressure we raise the boiling point of water.
Liquids boil when their boiling fumes/gas state reaches a pressure equal to the atmospheric pressure(external pressure). The higher the pressure you apply to a liquid the more gaseous state pressure has to reach high.
