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

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 Â°F, which is equal to 92.94 degrees Celsius, or 92.94 Â°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 Â°F or 101.1 Â°C (at approx -1000 ft or -305 m below sea level)

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

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

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

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

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

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

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

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

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

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

5 in. Hg: 165.85 Â°F or 74.36 Â°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 the elevation and air pressure affect the freezing point of water?

Answer . It does not very significantly because melting does not involve gas-phases molecules. Boiling, on the other hand, is strongly affected. See the Related Questions for how the boiling point of water is affected by air pressure. .

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 altitude and pressure affect the boiling or melting points of matter?

Answer . the higher the altitude the lower the air pressure which results in a lower boiling point in liquids.

How does elevation affect the freezing point of water?

Elevation has minimal affects on the freezing point of water as it doesn't deal with gas molecules as boiling does. Elevation affects the boiling point of water because the air pressure changes with elevation.

How does air pressure affect the temperature at which water boils?

Answer . There is a direct relationship between the temperature at which water boils and the air pressure on it. Higher pressure, higher boiling point. Lower pressure, lower boiling point.

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.

Does salinity affect the boiling point of water?

No it doesn't. It Doesn't because when you boil something it only boils the water, salt excluded, but it does effect the freezing point because anything can freeze.

Does pepper affect the boiling point of water?

Pepper has the least effect on the temperature or reaction toboiling water ,As well pepper does not dissolve in boiling waterlike other grains.

How does elevation affect air pressure?

the higher the elevation the lower the air pressure this happens because the higher the elevation the less dense the air

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)

Pressure has an effect on boiling point because pressure affects what?

In this case pressure affects things only passively. A liquid boils when it is hot enough so that its vapor pressure equals/exceeds the external atmospheric pressure. At lower temperatures the external prsssure collapses any bubbles that might form.

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.

How does air pressure change in altitude affect boiling water?

Water boils when the vapor pressure of water equals total atmospheric pressure. As air pressure drops, so does the boiling point. In a vacuum, water boils at "room temperature".

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 change in pressure affect the boiling point of a compound?

The greater the pressure that is exerted on a compound, the higherthe energy that is required to boil it. A decrease in the pressurewill also reduce a compound's boiling point.

Why does atmospheric pressure affect boiling point?

At a low pressure the boiling point is lower; at high pressure the boiling point is higher.

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

How does altitude affect the boiling point of water?

The higher the altitude the less air pressure there is bearing down on the water so its boiling point becomes lower.

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.

Why does altitude affect the boiling point of water?

Generally as pressure decreases boiling point decreases. At higher altitudes atmospheric pressure is lower, and therefore the boiling point of water is as well.

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)

Why does the boiling point of water decrease with higher altitude or elevation?

Boiling is when the vapor pressure of a liquid equals theatmoshperic pressure. Since at higher altitudes the atmosphericpressure is lower, the water can attain a vapor pressure equal tothis lower atmospheric pressure at a lower temperature.

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 water have a higher boiling point at higher elevations?

No. Water has a lower boiling point at higher elevations. The boiling point of water is only 69 o C instead of 100 degrees at the top of Mt Everest.

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 affect will pressure have on a liquids boiling point?

Lower pressure = lower boiling point. Water at high altitudes boils below 100 degrees Celsius.

What affect does atmospheric pressure have on the boiling point of a liquid?

The lower the atmospheric pressure the lower the boiling point of as liquid. The higher pressure the higher the boiling point.

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)

What is the boiling point of water at an elevation of 9000?

9000 what? At 9000 feet water boils at 196 degrees Fahrenheit (91degrees Celsius). At 9000 meters water boils at 153 degreesFahrenheit (67 degrees Celsius).

How would the air pressure at the Dead Sea affect the boiling point of water?

The Dead Sea is below mean sea level for the earth; therefore, the pressure at the Dead Sea would be greater than at mean sea level and the boiling point of water would be above 100C.

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)

What happens to the boiling point of water at higher elevations where atmospheric pressure is less?

The temperature decreases. For example if you want to boil and egg on top of a mountain then it will take longer.

How does the density of water affect its boiling point?

The boiling point (of any compound) is ONLY affected by (vapor) pressure. Density of a gas (vapor) is another property that -in another way- may be affected by pressure.

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)

Does boiling point affect the polarity of water?

No, boiling does not affect the polarity of water. What it does is create enough energy for the water molecules to separate from one another. But the water molecules are still polar.

How does a decrease in elevation affect air pressure?

The air pressure rises. When you go higher it lowers. That's why it gets harder to breathe as you elevate.

Would the boiling point of water be higher or lower on a mountain peakhow would the boiling point be affected in a pressurized system?

The higher the pressure being exerted on the water, the lower the boiling point becomes. Yes the boiling point is affected in a pressurized system. If you put water in a sealed container and kept raising the pressure it will eventually reach it's boiling point without the need of adding heat.

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 pressure affect freezing and boiling points of water?

Freezing not so much, but - in order to boil the vapor pressure of the water must exceed the total gas pressure surrounding it. Thus the higher the pressure, the higher the boiling temp.

How would the altitude and the atmospheric pressure of Johannesburg affect the boiling point of water?

The boiling point of water decrease when the altitude increase; the value at Johannesburg is near 94 0 C.

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)