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   <title>About.com Physics: What's Hot Now</title>
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   <description>These articles that had the largest increase in popularity over the last week</description>
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         <title><![CDATA[Free Falling Body]]></title>
         <link>http://physics.about.com/od/homeworkhelp/qt/hwh_freefall.htm</link>
         <description><![CDATA[How to calculate the initial height of a dropped object, given its velocity at a point during the fall.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Physics of a Car Collision]]></title>
         <link>http://physics.about.com/od/energyworkpower/f/energyforcediff.htm</link>
         <description><![CDATA[In physics, the distinction between the concepts of energy and force can be very subtle, but important.  Energy is an absolute measure of the system, whereas the force is specifically related to the set-up of the situation.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Six Simple Machines]]></title>
         <link>http://physics.about.com/od/physicsintherealworld/p/simplemachines.htm</link>
         <description><![CDATA[There are six kinds of simple machines which have few or none moving parts which provide great mechanical advantage.  Learn about these 6 machines and how they are used in your daily lives!]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Isothermal Process]]></title>
         <link>http://physics.about.com/od/glossary/g/isothermal.htm</link>
         <description><![CDATA[definition of an isothermal process]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Condensation]]></title>
         <link>http://physics.about.com/od/glossary/g/condensation.htm</link>
         <description><![CDATA[definition of condensation]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Theory of Relativity]]></title>
         <link>http://physics.about.com/od/relativisticmechanics/a/relativity_5.htm</link>
         <description><![CDATA[An overview of Einstein's Theory of Relativity.  Learn about special relativity &amp; general relativity, including the Lorentz transformations that make them possible.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Momentum]]></title>
         <link>http://physics.about.com/od/glossary/g/momentum.htm</link>
         <description><![CDATA[Definition of momentum]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[What is a Black Hole?]]></title>
         <link>http://physics.about.com/od/astronomy/f/BlackHole.htm</link>
         <description><![CDATA[A black hole is a curvature of spacetime geometry due to an intense gravitational field.  The effects of a black hole are so extreme that even light cannot escape it, thus the name.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[A headshot of Albert Einstein]]></title>
         <link>http://physics.about.com/od/alberteinstein/ig/Albert-Einstein-photos/Albert-Einstein-headshot.htm</link>
         <description><![CDATA[Photographs of Albert Einstein.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[De Broglie Hypothesis]]></title>
         <link>http://physics.about.com/od/quantumphysics/a/dbhypothesis.htm</link>
         <description><![CDATA[We discuss the De Broglie hypothesis, which proposes that all matter exhibits wave-like properties and relates the observed wavelength of matter to its momentum.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Electromagnetic Spectrum]]></title>
         <link>http://physics.about.com/od/lightoptics/a/electrspectrum.htm</link>
         <description><![CDATA[The electromagnetic spectrum of light spans from radio waves to gamma rays, including that band of colors that we're most familiar with: visible light.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Surface Tension]]></title>
         <link>http://physics.about.com/od/physicsexperiments/a/surfacetension.htm</link>
         <description><![CDATA[An explanation of surface tension, along with some basic experiments and tricks that make use of the phenomenon.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Experimental Methods]]></title>
         <link>http://physics.about.com/od/physics101thebasics/qt/experiments.htm</link>
         <description><![CDATA[An overview of how to conduct a scientific experiment.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Nuclear Fission]]></title>
         <link>http://physics.about.com/od/glossary/g/nuclearfission.htm</link>
         <description><![CDATA[Definition of nuclear fission]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Formulating a Hypothesis]]></title>
         <link>http://physics.about.com/od/physics101thebasics/a/hypothesis.htm</link>
         <description><![CDATA[Information on formulating a scientific hypothesis.  Here you will also find discussions of models, theories, and laws, as well as the differences between them.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Wave Interference]]></title>
         <link>http://physics.about.com/od/mathematicsofwaves/a/interference.htm</link>
         <description><![CDATA[The principle of superposition governs how waves interact, resulting in interference and diffraction.  Here you can learn about constructive and destructive interference, as well as manifestations of interference and diffraction.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
         </item>
         
         <item>
         <title><![CDATA[Physics Skills]]></title>
         <link>http://physics.about.com/od/classroomphysics/f/studyingphysics.htm</link>
         <description><![CDATA[If someone is interested in physics and wants to pursue it in college and as a career, there are a number of fundamental concepts they must become familiar with.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Plasma]]></title>
         <link>http://physics.about.com/od/glossary/g/plasma.htm</link>
         <description><![CDATA[Definition of plasma]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Kepler&#039;s Laws]]></title>
         <link>http://physics.about.com/od/astronomy/p/keplerlaws.htm</link>
         <description><![CDATA[Kepler's Laws describe, in three concise rules, the motion of orbital bodies in the solar system.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
         </item>
         
         <item>
         <title><![CDATA[Newton&#039;s Laws of Motion]]></title>
         <link>http://physics.about.com/od/classicalmechanics/a/lawsofmotion_4.htm</link>
         <description><![CDATA[Newton's third law of motion says that an object which provides a force also receives the same force back upon it - an &quot;equal and opposite reaction.&quot;]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Isobaric Process]]></title>
         <link>http://physics.about.com/od/glossary/g/isobaric.htm</link>
         <description><![CDATA[definition of an isobaric process]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Why Study Physics?]]></title>
         <link>http://physics.about.com/od/classroomphysics/f/whyphysics.htm</link>
         <description><![CDATA[Why should you study physics?  What is the use of a physics education?  If you aren't going to become a physicist, you may have questions such as these ... but there are good reasons for everyone to study physics.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Wave Particle Duality]]></title>
         <link>http://physics.about.com/od/lightoptics/a/waveparticle.htm</link>
         <description><![CDATA[We explore wave particle duality: the particle properties of waves and the wave particles of particles.  What do these strange properties mean?  How can we use them to understand physics?]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Dark Matter]]></title>
         <link>http://physics.about.com/od/glossary/g/darkmatter.htm</link>
         <description><![CDATA[Definition of dark matter.]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <item>
         <title><![CDATA[Mass]]></title>
         <link>http://physics.about.com/od/glossary/g/mass.htm</link>
         <description><![CDATA[Definition of mass]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
         </item>
         
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         <title><![CDATA[Adiabatic Process]]></title>
         <link>http://physics.about.com/od/glossary/g/adiabatic.htm</link>
         <description><![CDATA[definition of an adiabatic process]]></description>
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         <dc:subject>education</dc:subject>
         <dc:date>2009-07-04T10:07:46Z</dc:date>
         </item>
         
         <item>
         <title><![CDATA[Free-Body Diagrams]]></title>
         <link>http://physics.about.com/od/toolsofthetrade/qt/freebodydiagram.htm</link>
         <description><![CDATA[The first step in most physics problems is drawing a free-body diagram.  This article will provide you with the necessary information to tackle this process and use it effectively to help in physics problem-solving.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[What is Quantum Gravity?]]></title>
         <link>http://physics.about.com/od/quantumphysics/f/quantumgravity.htm</link>
         <description><![CDATA[Quantum gravity is an attempt to unify Einstein's theory of general relativity with quantum physics.  In essence, it tries to unify the four fundamental forces of physics into a coherent whole.  It is also called unified field theory.]]></description>
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         <dc:date>2009-07-04T10:07:46Z</dc:date>
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         <title><![CDATA[Thermodynamics Overview]]></title>
         <link>http://physics.about.com/od/thermodynamics/p/thermodynamics.htm</link>
         <description><![CDATA[Information on the field of thermodynamics, from the basics of temperature to kinetic theory to the laws of thermodynamics.]]></description>
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