How does the elevation and air pressure affect the boiling point of water?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

It depends only on the pressureThe only factor that determines the boiling point of water at any altitude is the barometric pressure (the altitude itself doesn't actually matter, it's just that at higher elevation, the barometric pressure usually drops). However, water will boil at two different temperatures at the same elevation if you are in a high pressure weather system instead of a low pressure system.

See the two Web Links listed to the left of this answer to find a chart of the standard barometric pressure at different altitudes (SableSys.com). Also, I've linked a very easy to use calculator to find the boiling point of water at any given barometric pressure (PrimoGrill.com). Just enter the pressure (the absolute pressure, not relative) and it gives you the boiling point!

As an example, here are the numbers under standard conditions for 7000 ft:

At 7000 ft, the standard barometric pressure is 23.088 inches Hg, and so water boils at 199.3 degrees Fahrenheit or 199.3 °F, which is equal to 92.94 degrees Celsius, or 92.94 °C. However, the pressure at 7000 feet will not always be exactly 23.088 in Hg (for instance, if a weather pattern changes the barometric pressure). It is more precise to specify the barometric pressure and ask the boiling point. Here is an equation to calculate the boiling point of water at any barometric pressure:

boiling point = 49.161 * Ln (Pressure in inches Hg) + 44.932

(where "Ln" is the natural logarithm in base e)

Here are other values for the boiling point of water a various barometric pressures and the approximate altitudes that corresponds to under normal conditions.

31 in. Hg: 214 °F or 101.1 °C (at approx -1000 ft or -305 m below sea level)

30 in. Hg: 212.15 °F or 100 °C (at approx sea level)

29 in. Hg: 210.3 °F or 99.06 °C (at approx 1000 ft or 305 m above sea level)

28 in. Hg: 208.44 °F or 98.02 °C (at approx 2000 ft or 610 m above sea level)

27 in. Hg: 206.59 °F or 96.99 °C (at approx 3000 ft or 914 m above sea level)

25 in. Hg: 202.89 °F or 94.94 °C (at approx 5000 ft or 1524 m above sea level)

23 in. Hg: 199.19 °F or 92.88 °C (at approx 7000 ft or 2134 m above sea level)

21 in. Hg: 195.48 °F or 90.82 °C (at approx 10,000 ft or 3048 m bove sea level)

19 in. Hg: 191.78 °F or 88.77 °C (at approx 12,000 ft or 3658 m above sea level)

17 in. Hg: 188.07 °F or 86.71 °C (at approx 15,000 ft or 4572 m above sea level)

10 in. Hg: 175.11 °F or 79.51 °C (at approx 27,000 ft or 8230 m above sea level)

5 in. Hg: 165.85 °F or 74.36 °C (at approx 42,000 ft 12,802 m above sea level)

NOTE: These pressure values are absolute values, as opposed to relative. Many types of pressure gauges measure relative pressure (such as the ones used to measure the pressure in bicycle or car tires). However, a barometer measures the absolute pressure (as well as most electronic pressure gauges). If using a relative gauge, you to find the absolute pressure, you must subtract the outside air pressure from the relative reading (so you must already know the outside air pressure using a barometer).




 More Info The boiling point of any substance is the temperature at which the liquid phase changes to the gas phase. The phenomenon called boiling is the formation of vapor bubbles within the liquid. Since heat must be applied from the environment to change a liquid into a gas, the container is hotter than the contents, and pockets of gas are generated which then rise to the surface and are dispersed.

The ambient air pressure affects how fast the molecules of the liquid must be moving to leave the liquid phase and enter into the gas phase. As the pressure drops, the speed, therefore the amount of energy, needed gets less, so the temperature at which the substance boils lowers

By the way, the reason a microwave oven can boil water without the cup getting very how is that the microwave energy heats the water molecules directly. So, rather than heating the container which transfers energy to the contents of the pot, the contents heat to boiling and then transfer energy to the container
95 people found this useful

How Does Atmospheric Pressure Affect Boiling Point?

boiling point of any fluid affected by the the surrounding pressure , as it is a condition for reaching boiling point for any fluid that its vapor pressure must equal to surrounding pressure , so the if u are at the earth , so the atmospheric pressure is about 1.012 bar so ur fluid must exert vapor (MORE)

What is the boiling point of water in pressure cooker?

Normally you have a pressure of approx. 2 bar (2kPa) in a pressure cooker. At this pressure the boiling point of water is 120 0 C (393 K) or 247 F See the Related Questions to the left for more information about how pressure affects the boiling point of water.

How does pressure affect the boiling point?

The boiling point of an element or a substance is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid. Vapour pressure or equilibrium vapour pressure is the pressure of a vapour in thermodynamic equilibrium with its condensed phas (MORE)

How does sugar affect the boiling point of water?

salt or sugar would lower the melting point and raise the boiling point. The salt or sugar would reduce the partial pressure of water in the solution (essentially more competition), effectively raising the boiling point.

How is the boiling point affected in a pressurized boiler system?

\nFor the purpose of this answer let me rephrase your questions to be more definite. As once the steam leave a boiler we can assume it remains in a gaseous state until it energy is absorbed by some load/ demand.\n. \nHow is the boiling point affected in a pressurized boiler?\n. \nThe short answer. (MORE)

How does air pressure affect the freezing point of water?

Well, I've experienced a wierd event in the dead of winter last year; At 12F there was liquid water in my car's plastic (PET) water bottle... I had drank about 1/3 of the bottle the evening earlier, then resealed it with the bottlesomewhat crushed. This "crushed" condition must have kept the content (MORE)

How does elevation affect the boiling point of water?

The boiling point of water is determined by a combination of the air pressure and the temperature. The lower the air pressure, which goes down as you go up in elevation, the less heat is required to get the 'rolling boil' necessary.

What factors affect the boiling point of water?

One factor that markedly affects the boiling point of water isatmospheric pressure. The boiling point is lower at higheraltitudes. Also, a certain amount of salt will increase the boilingpoint of water.

What effect does elevation have on the boiling point of water?

As elevation increases, boiling point decrease. Boiling point is the point at which atmospheric pressure equals vapor pressure. The vapor pressure of a substance is...In a liquid, there are always some particles that have enough energy to switch to the gas phase. There are also gaseous atoms of the (MORE)

How does altitude affect boiling point of water?

Higher altitude had lower pressure and lower the boiling point. For thermodynamics information, boiling is about when the vapour pressure equal to surrounding pressure. Since pressure increase with Temperature, reduce atmospheric pressure would required lower temperature to get water vapour pressur (MORE)

Boiling point of water under pressure?

At 0,5 bar water boils at about 176 °F or 80 °C At 1 bar water boils at about 212 °F or 100 °C At 2 bar water boils at about 250 °F or 120 °C See the link below for a graph, a table and an explanation.

Will the color affect the boiling point of water?

Dissolving anything in a substance will raise its boiling point. However, if you add a small amount of coloring, the difference will likely be negligible. Also, our water is not pure H 2 O. Rather, it contains several dissolved substances, ie fluorine, chlorine, etc.

How does lowering the pressure affect the boiling point?

Water, for example, boils when the vapour pressure of steam is at atmospheric pressure. As you heat water the vapour pressure rises. If the outside pressure was low (top of a mountain) then that vapour pressure would be reached at a lower temperature. The boiling point will decrease, because boiling (MORE)

How is vapor pressure related to boiling point elevation and freezing point depression?

Vapor pressure is a measure of how easily something evaporates. Therefore, if something has a high vapor pressure, it's likely to have a low boiling point. If it has a low vapour pressure, it's likely to have a high boiling point. For the same reason, if something has a high vapor pressure, it's li (MORE)

Does salt affect the boiling point of water and why?

Salt will increase the boiling point and decrease the freezing point of water due to colligative properties. Table salt (NaCl) breaks into ions when dissolved. This lowers the vapor pressure of water. When salt dissolves its ions are moving around in the water, and some are near the surface. Rather (MORE)

What happens to the boiling point of water when air pressure above the water is reduced?

If you reduce the air pressure you make it 'easier' for water particles to become gaseous as there are fewer gas particles colliding with them on the surface, reducing their energy. Without this interference they gain enough energy to become a gas at a lower temperature. The converse is also true. (MORE)

Why does pressured water have a raised boiling point?

Boiling is the phenomenon in which saturated vapour pressure becomes equal to the external pressure. Hence as we increase the external pressure then the boiling point has to increase so as to attain that pressure

How does sugar affect the point of boiling water?

Sugar is a hydrophilic (water-loving) molecule, so when it is added to water it will form intermolecular dipole-dipole bonds with the water molecules. . To change phase from liquid to gas, the water molecules must break all intermolecular bonds and become "free molecules". By increasing the n (MORE)

How do changes in elevation temperature and humidity affect air pressure?

When you go higher into the air, air pressure starts to decrease and when you are at sea level, air pressure very high. When the temperature is really high, air molecules start bouncing around rapidly and that creates high air pressure. This pressure is enough to blow up a balloon on it's own. Wh (MORE)

How does atmospheric pressure affect the boiling point?

Atmospheric pressure is the weight of the air column above a particular point on the earth's surface. This weight pushes down on any object beneath it. In the case of a liquid that is being heated to the boiling point, it prevents vapor from pushing through the surface of the liquid and out to the s (MORE)

How does air pressure affect a substance's boiling point Relate this principle to boiling water at sea level and on a mile high mountaintop?

Im not extremely sure about this but i think it has to do with how tight the substance's molecules are because i think with lower air pressure the molecules are loose so they boil because they aren't tight. If you had water at sea level the molecules would be tighter so they would have a higher boil (MORE)

How does pressure and impurities affects boiling point?

Boiling is used to describe a change of state of a pure liquid to vapour phase. The particular temperature at which this change of state occurs is defined as the boiling point of that specific liquid. Now the question is will addition of impurities have any effect on the boiling point of water. Th (MORE)

What do pressure cookers do to the boiling point of water?

Pressure Cookers raise the boiling point of water. As pressure increases on a liquid, so does the boiling point. This is due to the fact that a liquid will not boil until the vapor pressure of the liquid is equals the environmental pressure surrounding the liquid. Think of it essentially as the surr (MORE)

How does a change in pressure affect the pressure affect the boiling point of a compound?

The boiling point temperature of a compound increases as thepressure increases, until the pressure reaches the critical pressure of the compound.For water, you have : P ( kPa ) T ( C ) ------------ ---------- 1.0.............. 6.97 50....... .......81.32 100............ 99.61 101.325... 100.0 500.. (MORE)