# R2 | perplexity/sonar-pro | run 1

## Prompt

What is the boiling point of water at sea level, in both Celsius and Fahrenheit? Cite a source.

## Response

Water boils at **100 °C**, which is **212 °F**, at standard atmospheric pressure at sea level. This is the commonly accepted normal boiling point of pure water.

Several reputable sources specify that at sea level (1 atmosphere of pressure), the boiling point of water is 100 °C (212 °F):

- Wikipedia’s article on boiling point notes that the *normal boiling point* of water is **100 °C (212 °F) at 1 atm (101.325 kPa)**.[Boiling point – Wikipedia](https://en.wikipedia.org/wiki/Boiling_point)  
- NASA’s ocean sciences education page states: “Water freezes at 32° Fahrenheit (F) and **boils at 212°F (at sea level)**,” adding that on the Celsius scale, **100° is water’s boiling point**.[NASA Salinity](https://salinity.oceansciences.org/learn-more.htm?id=13)  
- The Lunar and Planetary Institute educational material similarly notes: “At sea level, pure water **boils at 212 °F (100°C)**.”[LPI – All About Water and Ice](https://www.lpi.usra.edu/education/explore/ice/background/allAboutWater/)  

While more precise thermodynamic measurements give values very close to 100 °C (such as 99.97 °C ≈ 211.9 °F), in practice and in standard references the boiling point of water at sea level is taken as **100 °C (212 °F)**.[Boiling point – Wikipedia](https://en.wikipedia.org/wiki/Boiling_point)  

Would you like a brief explanation of why altitude changes water’s boiling point?
