Try It Out Are you ready to take your knowledge to a higher level? Grab a friend or family member and check out the following activities: Want to take part in a science experiment with other kids around the world? Jump online to check out Under Pressure: Boiling Water. You'll need help from an adult friend or family member.
The goal is to see at what temperature water boils where you live. You'll need a few simple items to get started. When you're finished, you can enter your findings online and compare them with other results from around the world! When you need to boil water, does it matter whether you start out with hot or cold water? Find out by doing your own experiment.
Follow the instructions for the Hot vs. Cold Water: Boiling Experiment online. What do you think the answer will be? Write down your hypothesis, and then conduct the experiment.
What did you learn? Was your pre-experiment hypothesis correct? If you do much cooking, you will often see instructions that tell you to add salt to boiling water. Find out today by conducting a simple experiment.
Be sure to get help from an adult friend or family member before conducting the experiment. Share what you learn with them! Did you get it? Test your knowledge. What are you wondering? Wonder Words bowl meal cook skill heat fact cereal ascend mountain altitude pressure molecule delicious convenience straightforward circumstance atmosphere ingredient Take the Wonder Word Challenge.
Join the Discussion. Dom Mar 21, This article helped me with my chemistry homework. Thanks for making this as concise and as informational as possible! I'm not even in college and I know how to cook. Now you have supported the fact that I'm different than many kids.
Jun 12, May 23, We hope this means that you liked this Wonder!! Aliya McCurry Sep 20, The boiling point of water, or any liquid, varies according to the surrounding atmospheric pressure. A liquid boils, or begins turning to vapor, when its internal vapor pressure equals the atmospheric pressure. But pressure drops as you gain elevation — say, by driving from Los Angeles to Denver — because there are fewer air molecules pressing on you.
In Denver, the atmospheric pressure is only about 12 pounds per square inch, compared with Putting a liquid in a partial vacuum also will lower its boiling point.
In La Rinconada, a mining town in the Peruvian Andes that, at more than 16, feet, is the highest permanently inhabited town in the world, water will boil at about degrees. At another extreme, in Death Valley, Calif. Cooking generally takes longer at elevations above 3, feet or so, and foods tend to dry out faster. Doughs will rise faster because gases expand more and liquids in batters evaporate faster.
The vapour pressure is the pressure exerted by the gas when the amount of particles leaving the liquid equals the amount of particles entering the liquid from facweb. This increases the vapour pressure. When the vapour pressure equals atmospheric pressure, the liquid boils. Here's a video that demonstrates the effect of atmospheric pressure on boiling point.
Related questions How are vapor pressure and boiling point related? How do you find vapor pressure given boiling point and heat of vaporization? Why is vapor pressure reduced in a solution?
So if there is less air pressure pushing on the water is less it requires less energy for the water to boil. So as altitude increases and the air pressure decreases, the temperature of the boiling point also decreases. How does the boiling point of water change as altitude increases? David Drayer. May 15, As the altitude increases the boiling point of water decreases.
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