How the chemistry in pregnancy tests work
By: Janet Grischy
If a trained technician uses a home pregnancy test, it has an accuracy rate of 97%. If an untrained woman uses one, the accuracy is much less. Why the difference? The technician is trained in precision and procedures, but, more important; she reads and follows...
An overview of the chemical element Hydrogen
By: John Traveler
Hydrogen is perhaps the most interesting of the elements in the universe, if not its simplest and most abundant one. Atoms of hydrogen represent about 75 percent of all the matter in the cosmos, and even the Earth's crust contains more hydrogen than it does...
By: Adewale Olowode
Without mincing words,our knowledge of motion may never be complete without a mention of projectile motion.Eventhough motion may be translational,rotational,vibrational,or deformational,projectile motion belong more to the group of translational motion.Everywhere you go,everywhere you look,everywhere you stand...
The use of X-rays in studying the atomic structure of a crystal
By: Jeffrey Graf
The fundamental principle employed in the use of X-ray crystalography, or the calculation of a crystal's structure is called Bragg diffraction. You may have noticed that when you look at the surface of a CD, you see a rainbow of colors. This is because when...
Science projects you can do at home
By: James Johnson
Science is learning about the world around us in a rational, logical fashion and it is important that it be encouraged as early as possible. What better way to do this than setting up fun and interesting science projects at home? What are some simple...
How airplanes fly
By: JJ Whitehead
How an Airplane Flies: A Question of Physics Many people look to the skies and see a streak of white smoke through the clouds, smiling as they realize that they are seeing the trail of a jet or some other type of airplane. With a...
How electricity is generated
By: Earl King
HOW ELECTRICITY IS GENERATED Electricity is a form of energy. It can't be created or destroyed. It can only be converted from or to another form of energy. So let's explore where the energy comes from. Heat energy can be produced from the splitting of...
Braking distance and reaction time
By: JJ Whitehead
Braking Distance and Reaction Time: How to Avoid Incidents on the RoadwaysThere are many situations that drivers, young and old alike, might be faced with on the road during even the shortest of trips. This situation could relate to anything from hazardous conditions to inattentive...
By: Adewale Olowode
The wattage rating is a very important parameter in resistors.It indicates the maximum amountof power a resistor can dissipate as heat before drastically changing value or burning up.Thatis,if power is the time rate of doing work,and energy can be changed from...
By: Ernest Capraro
Colors pervade much of chemistry. Sure, some days it seems like almost everything is a white powder or a clear liquid, but a little mixing, and - presto - you've got any color you desire.If you want a rainbow of chemical colors, the first...

 

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