# R2 | anthropic/claude-opus-5 | run 2

## 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 (212 °F)** at sea level, where standard atmospheric pressure is 1 atmosphere (101.325 kPa, or 760 mmHg).

## Key Details

- **Celsius:** 100 °C
- **Fahrenheit:** 212 °F
- **Kelvin:** 373.15 K

This value defines the upper reference point of the original Celsius scale, with 0 °C set at water's freezing point. Reference: [NIST Water Properties](https://www.nist.gov) and [Britannica: Boiling Point](https://www.britannica.com/science/boiling-point).

## Why Elevation Matters

Boiling point drops as atmospheric pressure decreases, roughly 1 °C for every 285 meters (about 935 feet) of elevation gain. In Denver (about 1,600 m), water boils near 95 °C (203 °F), which is why high-altitude cooking requires longer times or pressure cooking.

Would you like a conversion table showing boiling points at common elevations?
