Archives of Ask A Scientist!
About "Ask A Scientist!"
On September 17th, 1998 the Ithaca Journal ran its first "Ask A Scientist!" article in which Professor Neil Ashcroft , who was then the director of CCMR, answered the question "What is Jupiter made of?" Since then, we have received over 1,000 questions from students and adults from all over the world. Select questions are answered weekly and published in the Ithaca Journal and on our web site. "Ask A Scientist!" reaches more than 21,000 Central New York residents through the Ithaca Journal and countless others around the world throught the "Ask a Scientist!" web site.
Across disciplines and across the state, from Nobel Prize winning scientist David Lee to notable science education advocate Bill Nye, researchers and scientists have been called on to respond to these questions. For more than seven years, kids - and a few adults - have been submitting their queries to find out the answer to life's everyday questions.
Therefore, three out of the four "elements" of the alchemists are simple combinations of atoms. It would be nice to describe fire in the same way. Unfortunately, that doesn't work. Now don't get me wrong; when you look at fire, what you see is a bunch of atoms. In a flame, you'll find nitrogen, carbon, oxygen and hydrogen atoms. But the reason it glows and produces heat, the reason we call it fire, lies in what is happening to those atoms.
Fire almost always occurs when a fuel such as gas, wood or paper is put in contact with oxygen at a high enough temperature. When this happens, oxygen atoms (mostly from the air) and carbon atoms (from the fuel) are able to break free and bond together to form molecules such as CO2. By doing so, they release energy in the form of heat, and light that you can see. Some of the heat comes out of the fire to warm up its surroundings. Some of it is also used to break other carbon and oxygen atoms free and allows the fire to keep burning. Finally, the heat makes some of the soot particles in the fire so hot they glow, just like the element of an electric stovetop. This is what gives wood fires their orange color.
So fire is a process, a chemical reaction, between atoms. These atoms have a mass, but they would be there and have the same mass even if a fire wasn't burning. Hence the fire itself, being a process rather than an object as the alchemists thought, does not have mass.
- Are there any nontoxic ingestible fluorescent materials?
- Is popping popcorn a physical or a chemical change?
- Why do drops of water cling to glass?
- How come ice skates slide over ice so easily when hydrogen bonds usually make things stick?
- Why is a mirror left-right reversed, and not up-down backwards?
- Can humans ever see in the dark with no night vision glasses or other aids?
- How do scientists know there are such things as atoms?
- Can an infrared beam conduct an electrical current?
- After mixing 1oz of cornstarch and some water together, why does it get hard when pressure is applied? And then when the pressure is released, the mixture becomes drippy?
- How does a glow-stick work and how come neon glows?