Why does the boiling point of water decrease with altitude?
As elevation increases, atmospheric pressure decreases because air is less dense at higher altitudes. Because the atmospheric pressure is lower, the vapour pressure of the liquid needs to be lower to reach boiling point. Therefore, less heat is required to make the vapour pressure equal to the atmospheric pressure.
At sea level, water boils at 212 °F. With each 500-feet increase in elevation, the boiling point of water is lowered by just under 1 °F. At 7,500 feet, for example, water boils at about 198 °F. Because water boils at a lower temperature at higher elevations, foods that are prepared by boiling or simmering will cook at
- The heat energy consumed for a change of state from liquid to gaseous (or vapor) is known as latent heat of evaporation of the substance, water in the instant case.The boiling point of water using Kelvin scale of temperature measurement is 373 degrees Kelvin or 100oC. The freezing point of water is 273 degrees Kelvin
- Boiling Point of Water at Different Altitudes
Altitude ft. (meters) Boiling Point - Fahrenheit Boiling Point - Celsius 8000 ft. (2438 m.) 197 ºF 91.5 ºC 8500 ft. (2591 m.) 196 ºF 91 ºC 9000 ft. (2743 m.) 195 ºF 90.5 ºC 9500 ft. (2895 m.) 194 ºF 90 ºC
- Milk is a mix of butter fat and water so it is slightly heavier than water. The boiling points of liquids are due to the gravity of the liquid. Water boils at 100 degrees Celsius (212 degrees Fahrenheit). While milk boils at 212.3 degrees Fahrenheit.
After water changes from a liquid to a gas (at 212 degrees Fahrenheit) it can actually heat up much hotter than that. In the gas form, water molecules are spread out and have a lot of room to move and get much hotter than the other two phases (liquid and ice). And water freezes at 32 degrees Fahrenheit.
- After water changes from a liquid to a gas (at 212 degrees Fahrenheit) it can actually heat up much hotter than that. In the gas form, water molecules are spread out and have a lot of room to move and get much hotter than the other two phases (liquid and ice). And water freezes at 32 degrees Fahrenheit.
- In the case of supercooling, boiling water would also be hotter than steam at the same pressure. The opposite would be true for superheated steam. Pro tip: don't do it - your eggs will always be undercooked! Water boils at a lower temperature at elevation because the atmospheric pressure is lower.
- So when I say that oil has a higher boiling point than water, what I am actually saying is that the chemical bonds that hold oil together are stronger than the ones holding water together - it takes more heat to break them apart.
For pure water, the boiling point is 100 degrees Celsius (212 Fahrenheit) at one atmosphere of pressure, and the melting point is 0 degrees Celsius (32 degrees Fahrenheit) at one atmosphere of pressure.
- On the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit (°F) and the boiling point is 212 °F (at standard atmospheric pressure). This puts the boiling and freezing points of water exactly 180 degrees apart.
- At a standard atmospheric pressure (1 ATM), blood boils at approximately the same temperature as water: around 100 degrees Celsius, or 212 degrees Fahrenheit. Blood is approximately .9% salt, which at that concentration would raise the boiling point by less than 1 degree Celsius.
- We've all been taught that water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin. That's not always the case, though. Scientists have found liquid water as cold as -40 degrees F in clouds and even cooled water down to -42 degrees F in the lab.
Updated: 2nd November 2019