Introduction Brake fluid is one of those things that's easy to forget about, but it's essential for keeping your car safe and functional. Brake fluid is used in hydraulic systems to provide friction between moving parts, such as brake pads and discs. DOT 3 brake fluid has been around for many years, but DOT 4 […]

Introduction Have you ever wanted to create a shadow in a vacuum? I have, and it is possible. The key is creating the shadow first, then creating the object with it. First, we'll need to create a new layer with nothing on it. Then we'll add a drop shadow effect from Photoshop's Effects menu. Finally, […]

Introduction If you've ever been in a job interview, you know it can be intimidating. It can be difficult to stand out from the crowd and find a way to present your skills and strengths in such a way as to land the position. It might not always be possible to stand out through your […]

Introduction The Federal Bureau of Investigation has a budget of over $8 billion, which it uses to fund its operations. In addition to paying for weapons and other equipment, part of this money goes towards renting out airplanes for investigations when necessary. The FBI does not have its own fleet of private jets or aircrafts, […]

Introduction In 1872, the United States Census Bureau designated the center of the country as a point in Texas. But after years of research and testing different criteria, we’ve come to a shocking conclusion: There is no single “official” location for the center of America. Instead, we have several different possible candidates that all claim […]

Introduction I get this question a lot: "If oxygen supports combustion, and nitrogen doesn't, why can't I breathe in pure nitrogen?" The short answer is that you can—you just won't burn up as quickly. We'll also look at what happens when you mix nitrogen with other gases like hydrogen or helium. Nitrogen does not support […]

Introduction Why do we prefer air instead of oxygen during combustion? Combustion of a fuel takes place in presence of oxygen to form CO2 and H2O. Now, if we increase the amount of oxygen in air, combustion will take place at a faster rate. In such cases there is a possibility that the material being […]

Introduction Is there a membrane or filter that can separate nitrogen and oxygen? Yes. Membranes and filters are common industrial technologies. Two types of membrane systems separate air into oxygen from nitrogen by making use of the different molecular weights of these two gases. The other is a pressure-swing adsorption based system that takes advantage […]

Introduction An enantiomer is a molecule that is not superimposable on its mirror image. This means that the mirror image of an enantiomer does not superimpose onto itself. Due to spatial asymmetry, it is impossible for an object to be superimposed onto its mirror image (unless the object is circular). There are two ways in […]

Introduction RPM, or revolutions per minute, is a unit of measurement that describes the speed at which something rotates. RPM is most commonly used in measuring engines and other machines that operate with rotating parts. When calculating RPM you need to know three things: the number of times something has rotated in one minute, how […]