September 27th is Crush A Can Day and it’s a day to serve as a reminder that we CAN recycle our aluminum CANS! We love recycling and we’ve got a hot way to do it, with the help of science.
This is an experiment we recommend doing at home! All you need is a can, water, something hot like a stove, and tongs to keep you safe. First, scoop a little water into the can. By heating up the can, water expands into steam. This steam starts taking up all the room in the can, pushing out air.
Seal the can with water. This causes two things:
The water cools down the steam, condensing it back into water.
Air can’t get back in the can.
If air can’t get back in the can, and the steam is now taking up a lot less room because it’s cooler and condensed, you’ve created a can with nothing much in it- a vacuum! Our atmosphere exerts pressure on us all day every day. Up in Idyllwild, around 5000 feet in elevation, our atmosphere pushes about 12 pounds on every square inch of us (AKA 12 PSI). We typically don’t notice this pressure because it’s everywhere and usually evened out. But, not the case with our vacuum-can! And so, the can gets crushed by the pressure of our atmosphere that’s always there.
We hope we’ve inspired you to recycle, and maybe experiment along the way!
An Oudin coil can take the energy out of your outlet and create sparks you can see! It’s sometimes called a mini tesla coil. The sparks on them usually look violet.
If you know the visible light spectrum, you might know that violet light is the most energetic color of light.
The oudin coil looks like it’s putting out a lot of energy, but there’s a different reason for the violet sparks. In fact, the color of the sparks don’t always have to be violet like most people see. To demonstrate, check out the oudin coil when it sparks in something else, like carbon dioxide. An easy way to get a bunch of carbon dioxide in one place is with its solid form — dry ice!
When surrounded by CO2, the sparks from this oudin coil are clearly a different color!
The reason for the color shift is because of what is surrounding the oudin coil. Our air is less than 1% carbon dioxide. When sparking in air, the coil surrounded mostly by different gases (mainly nitrogen and oxygen). The answer to why that makes a difference is the same answer as to why different gases glow different colors when you put a lot of energy into them.
If you split apart this light, with something like diffraction glasses, you’ll see each type of gas has a unique spectrum of light. The study and use of this phenomenon is called spectroscopy.
Spectroscopy is a way of identifying gases, and it’s how we know what far away things like stars are made out of! On a tiny molecular scale, CO2 and what makes up our air are fundamentally different, and will create differences we can see… if we are clever enough to notice. By playing with this oudin coil and looking at colors, we’re revealing secrets about a seemingly invisible world.
We would like to thank you for visiting our blog. AstroCamp is a hands-on physical science program with an emphasis on astronomy and space exploration. Our classes and activities are designed to inspire students toward future success in their academic and personal pursuits. This blog is intended to provide you with up-to-date news and information about our camp programs, as well as current science and astronomical happenings. This blog has been created by our staff who have at least a Bachelors Degree in Physics or Astronomy, however it is not uncommon for them to have a Masters Degree or PhD. We encourage you to also follow us on Facebook, Instagram, Google+, Twitter, and Vine to see even more of our interesting science, space and astronomy information. Feel free to leave comments, questions, or share our blog with others. Please visit www.astrocampschool.org for additional information. Happy Reading!