Does boiling water change its taste or smell?

Water Purification and Boiling

When you boil water, you are not just killing bacteria and viruses, but also removing any dissolved gases, minerals, and other impurities. This process involves the evaporation of water molecules, which can lead to a slight change in the water’s composition. For example, boiling water can reduce its dissolved oxygen content by up to 70%. However, this reduction is not a significant concern for human consumption.

Taste and Boiling

The taste of boiled water is generally not affected by the boiling process. This is because the boiling point of water is 212°F (100°C) at sea level, and at this temperature, most dissolved solids and flavor compounds remain intact. However, if you add salt or other minerals to the water during the boiling process, it can change the taste. For example, adding 1 teaspoon of salt to 1 liter of water can increase its boiling point by up to 0.5°C.

Smell and Boiling

The smell of boiled water can be affected by the presence of volatile organic compounds (VOCs) and other dissolved gases. When you boil water, you can release these compounds, which can give the water a slightly “burnt” or " metallic" smell. This is especially true when boiling salt-free water over an open flame, as the absence of minerals can allow these compounds to accumulate and release more easily. To minimize this effect, you can boil water in a covered container or use a water purification method that removes VOCs and other impurities.