You’ve heard of fighting fire with water, but did you know that gases also have the power to douse flames? A gas can smother a blaze by creating a barrier between burning fuel and nearby air. Removing any of the three requirements for fire stops the combustion reaction. Image credit: Ohio Northern University Fire
You’re carrying an awful lot of weight right now. It’s hard to tell, but every square inch of you is supporting fifteen pounds of atmospheric pressure! Multiply that by the number of square inches on the surface of a human body, and you’ll find you’re bearing a hefty load. Atmospheric pressure results from the
November 2, 2000. It was a dark night on our planet. More than 200 miles above Earth’s surface, a Soyuz rocket began a slow dance in the bigger darkness of space. The docking sequence took three hours and forty minutes. At its end, the International Space Station welcomed the first of hundreds of human residents.
Electricity is everywhere! That isn’t a joke. Electricity is simply the movement of electrons. Electrons are found in atoms which make up all of the molecules in our bodies, and don’t like to stand still. Electricity can be tricky to describe and understand, but most of us have felt it in some way. Have you
Thomas Edison famously invented the incandescent light bulb. These light bulbs are pretty simple things. They are really just a glass casing around a tiny metal resistor called the filament. As electricity runs through it, the filament heats up until it produces light. But how much does it have to heat up? It turns