when the pressure increases the boiling point of liquid?

Answer 1

when the pressure increases the boiling point of liquid drops below normal. Pressure cookers are based on this very principle. Thus, Boiling Point is inversely proportional to pressure.

Answer 2

I was actually under the opposite opinion as the people above me. Decreasing the pressure will create an abnormally low boiling point. (If you put water in a vacuum, you can even lower the bp to room temp and below.) This only makes sense because there is less force keeping the molecules in liquid form.
*shrug*
Take it or leave it.

"At higher elevations, where the atmospheric pressure is much lower, the boiling point is also lower. The boiling point increases with increased ambient pressure up to the critical point, where the gas and liquid properties become identical. The boiling point cannot be increased beyond the critical point. Like wise, the boiling point decreases with decreasing ambient pressure until the triple point is reached. The boiling point cannot be reduced below the triple point."

and as for pressure cookers?

"Pressure cooking is a method of cooking in a sealed vessel that does not permit air or liquids to escape below a preset pressure. Because water's boiling point increases as the pressure increases, the pressure built up inside the cooker allows the liquid in the pot to rise to a temperature higher than 100 °C (212 °F) before boiling."

Answer 3

The boiling point increases with increasing pressure.

I'm surprised how many people got the answer backwards, even some of those who used a pressure cooker as an example. A possible reason could be that pressure cookers are popular at high altitude where the boiling point (and cooking speed) would be lower if a pressure cooker is NOT used.

" cotofana_ana" has a good answer and even makes an effort to explain why. I do wish she has cited her sources though, it is considered good practice to do so, especially when copying and pasting verbatim passages.

Answer 4

when the pressure increases the boiling point of liquid increases.

The pressure cooker works in this principle. As the pressure is increased water boils at a higher temperature.

Answer 5

INCREASES

The principal of the pressure cooker is to increase the temperature of the water so that food cooks, or cooks quicker. At high altitudes, the atmospheric pressure is much lower and water finds it easier to boil, requiring less energy (and therefore heat/temperature) to boil. This occurs at a lower temperature and food may not cook, or cook quickly enough.

The pressure cooker forces the boiling point up as it requires more energy to stop the water vapour molecules from returning to the liquid.

Answer 6

"Hamph" is correct but this is easy to explain.

Say your a child is jumping up and down in front of you, and you do not want the child to jump, you just tell him but the child is not stopping so you hold the child down. Pressure does the same thing to water molecules, stops it from jumping up and down, restrict the boiling motion.

Example water at sea level (1 atmosphere pressure) boils at 212 degrees F. When you use a cooker you can stop the water from boiling away at 212 degrees, depending on the type and the setting( I have 3 setting, 5,10 and 15), it will boil at set temperature other then 212 degrees F. so the food takes less time to cook, and the volatile stuff like vitamins are also preserved in the food.

At high altitude, it is not possible to cook without cooker or without adding certain things to the cocking kettle(my mother would add "Whole Sopary" or stones and salt whole cooking). At high altitude water will boil at lower temperature then the required temperature to cure the food, so without intervention, food will not cook properly.

Sopary and stones beat the food to make it tender(as specially tuft meat. Adding salt will increase the boiling temperature also.

Answer 7

when the pressure increases the boiling point of liquid drops . Pressure cookers are based on this very principle. Thus, Boiling Point is inversely proportional to pressure.

Answer 8

With increase in pressure the boiling point of the liquid increases.Based on this principle only liquefied gases and fuel are stored in bullets/receivers.

Answer 9

Decreases with respect to the boiling point at lower pressure.

Answer 10

Increases.