In this video from Grenoble, France, two teams of people attempt to separate the halves of a metal ball. Spoiler: The ball wins.
There are no magnets involved, nor are the two sides of the ball locked to each other with any physical device. Instead, what you see here is a classic, hands-on physics demonstration that's been a crowd-pleasing favorite since 1654.
Magdeburg Hemispheres is the fancy name for the two halves of a hollow metal ball that you see in this video. You hold them together, hook them up to an pump, and suck out all the air from the cavity in between. What you're left with is a vacuum ... and a great way to show people the power of atmospheric pressure. At Skulls in the Stars, Greg Gbur explains:
All objects within the atmosphere are under constant bombardment from air molecules traveling every which way; this atmospheric pressure is not noticeable to us because our bodies have an internal pressure that matches and balances it.
When the hemispheres are first placed together, the air pressure within them balances the air pressure outside, and they are easily pulled apart. When air is removed from the interior of the hemispheres, however, there is no longer any force pushing outward: the atmospheric pressure outside dominates, pushing the hemispheres together and keeping them from being separated.
In the original Magdeburg Hemispheres demonstration, teams of horses couldn't separate the vacuum sealed ball.
At this year’s Conference on Computer Vision and Pattern Recognition, researcher Chen Chen presented a cool project that vastly improves the quality of images captured in low-light conditions. Via his presentation: Imaging in low light is challenging due to low photon count and low SNR. Short-exposure images suffer from noise, while long exposure can induce […]
Yeast has brought a lot of joy into the world, but its evolutionary origins were unclear until scientists did a worldwide genomic survey of the humble organism. Based on the genetic diversity of strains found in China, they concluded that its origin is almost certainly in that part of the world.
I'm one of several guests appearing at the first-ever Interplanetary Festival, coming up Jun 7/8 in Santa Fe, New Mexico; it's a science festival that's part of the larger Futurition|Santa Fe festival, which includes live music, open air events, gaming, art installations, performances, and all-ages events.
Handheld radios might seem a bit archaic, but in an emergency situation, few things will keep you as reliably connected to the outside world. This Emergency Multi-Function Radio & Flashlight takes the utility of the tried-and-true radio and combines it with a powerful flashlight and self-sufficient energy system. It’s available in the Boing Boing Store for […]
Few programming languages boast the versatility and user-friendliness of Python, which is why it’s the first language of choice for many aspiring programmers. Regardless of your experience level, you can take the first step to becoming Python-savvy with the Python 3 Bootcamp Bundle, available in the Boing Boing Store for $35 this week. Featuring more than […]
We live during a time where cyberattacks regularly make news headlines, so it should come as no surprise that cybersecurity professionals are experiencing a surge in demand at even the entry level, making now the ideal time to learn the tools of the trade if you’re considering a career switch. The 2018 Supercharged Cybersecurity Bundle offers […]