The Action Lab's James Orgill writes, "In this video I show you how it is possible to contain the fire from a burning ball of propane in a wire mesh." Yes, it is possible. But that doesn't mean you should do it. In fact, you shouldn't.
The experiment demonstrates the phenomenon behind the Davy Lamp, a lamp that Sir Humphry Davy invented in 1812 for use in coal mines. From Wikipedia:
The lamp consists of a wick lamp with the flame enclosed inside a mesh screen. The screen acts as a flame arrestor; air (and any firedamp present) can pass through the mesh freely enough to support combustion, but the holes are too fine to allow a flame to propagate through them and ignite any firedamp outside the mesh. It originally burned a heavy vegetable oil.
The lamp also provided a test for the presence of gases. If flammable gas mixtures were present, the flame of the Davy lamp burned higher with a blue tinge. Lamps were equipped with a metal gauge to measure the height of the flame. Miners could place the safety lamp close to the ground to detect gases, such as carbon dioxide, that are denser than air and so could collect in depressions in the mine; if the mine air was oxygen-poor (asphyxiant gas), the lamp flame would be extinguished (black damp or chokedamp). A methane-air flame is extinguished at about 17% oxygen content (which will still support life), so the lamp gave an early indication of an unhealthy atmosphere, allowing the miners to get out before they died of asphyxiation.
In this video, The Q Cut a small hole in a cardboard box and placed a small piece of meat in it for his cat to take. Then, he put a new piece of meat in the box, a little farther away, to see if the cat would be able to reach it. He repeated […]
I’m not sure if the first thing on my to-do list with a late model $1,000 handset would be to tether it to a whack of party balloons and launch it into the atmosphere, but hey: to each their own. That said, you can’t argue with the view!
A low velocity vortex cannon isn’t too hard to make, but a vortex cannon that’s this high velocity takes a lot of trial and error.
With all due respect to our vegetarian friends, there might be nothing more intrinsically linked to the 4th of July holiday than a big ole cookout. Sure, fireworks and celebrating the birth of a constitutional republic are great too, but showing off your cooking prowess with a brilliantly seared, mouth-watering slab of grade-A American beef […]
We’re at the midway point of 2020. So…how’s the year going for you so far? Yeah…we can guess. But while there’s a lot about 2020 we can’t directly control, maybe a little retail therapy can help make you feel better. Sure, the 39 items we gathered together can absolutely bring a smile to your face. […]
When revved-up kids used to dribble a basketball through the kitchen or practice their footwork with a soccer ball in front of the television, exasperated parents would often just send ‘em outside to play. But these days, sending kids out might not be the best course of action. Despite all the changes, many budding young […]