Which one of the following statements is correct ? Boiling point of water

The boiling point of a liquid is defined as the temperature at which its vapor pressure equals the surrounding atmospheric pressure [t1][t2]. While the 'normal' boiling point of water is 100°C at sea level (1 atm), this value is not constant [t1][t6]. As altitude increases, atmospheric pressure decreases, allowing water molecules to escape into the gaseous state more easily and thus lowering the boiling point [c1][t3]. For instance, at high elevations like Mt. Everest, the significantly lower air pressure results in a much lower boiling temperature compared to sea level [c5][t1]. Conversely, increasing the ambient pressure, such as in a pressure cooker or deep ocean environments, raises the boiling point [c1][t5]. Factors like the source of heat or the material of the container do not determine the fundamental boiling point, which is strictly a function of the liquid's properties and the external pressure [t2][t3].

Sources

1. [1] https://www.sciencedirect.com/topics/earth-and-planetary-sciences/boiling-point
2. [2] https://mars.nasa.gov/education/modules/water_activity5.pdf
3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 3: Geological Time Scale The Evolution of The Earths Surface > 3. Geological Time Scale – The Evolution of The Earth's Surface > p. 43
4. [4] https://lambda.gsfc.nasa.gov/product/suborbit/subonlambda/DASI/astro.uchicago.edu/cara/southpole.edu/boil.html
5. [5] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Vertical Variation of Atmospheric Pressure > p. 305