Boiling point of water

Water is by no doubt one of the most important element of life. Humans, animals, plants and various other organisms cannot survive without water. We use water for drinking, cooking and other chores. Majority of the people in the world are forced to consume impure water as they have no access to potable drinking water. Consuming impure water can cause sickness along with a lot of health complications. According to World Health Organisation (WHO), water borne diseases account for the deaths of 1.8 million people every year. The simplest way to make impure water fit for consumption is by boiling it.

A lot of us boil water and consume it on a daily basis. Have you ever wondered about the boiling point of water? Water boils at 100 degrees Celsius or 212 degrees Fahrenheit under standard conditions. The boiling point of water may increase if any solvent is added to it. It also changes along with the altitude. Water takes a higher time to boil at altitudes higher than the sea level.

Boiling point of salt water

Water to which a salt is added takes more time to reach the boiling point compared to water with no salt in it. This is because common salt (NaCl) is a solvent. When a solvent is dissolved in a solution (Water) it lowers the vapour pressure. The molecules in a solution with lower vapour pressure need to be heated at a higher temperature to vaporise. To put it in simple words, a solution with lower vapour pressure always requires a higher temperature to boil. Hence, adding salt to water increases the boiling point.

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