Energy is the fundamental property of all objects in the universe. Energy can be transferred and transformed, but never created or destroyed.

Common forms of energy include: Kinetic energy of a moving object, the radiant energy carried by light, the potential energy stored by an object’s position in a force field (gravitational, electric or magnetic), elastic energy stored by stretching solid objects, chemical energy released when a fuel burns, and the thermal energy due to an object’s temperature.

Mass and energy are “equivalent” (mass-energy equivalence), but not exactly the same thing. Energy and mass can be converted into each other mathematically, and conserved as each other physically.

All things in the universe, especially living organisms and systems, require energy. A good example of how energy fuels the universe being that humans get energy from food (calories).


Factoids tagged with "Energy"

Fat Makes You Fat Myth

Fat can make you fat, but it isn’t the only thing that causes weight gain. Fat is high in calories and is easy to store as fat cells, but in general, it is storing more calories than you burn (from fat, carbs, or protein) that causes weight gain.

All Waves Transfer Energy Fact

All waves (including sound waves, electromagnetic waves, and even water waves) transfer energy, and all energy is transferred in a wave-like motion.

Sound Always Travels Slower than Light Myth

Sound usually travels slower than light, but not always. Under normal conditions, light moves roughly a million times faster than sound, but under the right conditions sound can travel faster than light.

Information Can Escape from a Black Hole Myth

The Black Hole Information Paradox suggests information can’t escape a black hole intact. While new theories show information may be able to escape, it hasn’t been proven as of 2016.

Human Behavior can be Random Fact

Human behavior can be random to some extent, but most behavior is based on prior input, and thus is “deterministic” (meaning not totally random).

Light is Both a Particle and a Wave Fact

Light is a particle (a photon), that acts like a wave (“both a particle and a wave”), which can be measured as an excited quantized state of the electromagnetic field.

LED is a New Technology Myth

The first light-emitting diode (LED) was created in 1927, but LED technology wasn’t mass-marketed or mass-produced until the 1990’s.

Feed a Cold, Starve a Fever Myth

The old saying “feed a cold, starve a fever” has truth to it, but generally you should feed a cold and a fever and starve neither.

Light Can Affect Mood Fact

Exposure to light in moderation, especially natural sunlight, can have an uplifting effect on mood, while excessive darkness can have the opposite effect.

The Universe is Mostly Empty Space Myth

The universe and everything in it, including humans, is mostly “empty space”. However, space is not actually “empty”, it’s filled with quantum fields and dark energy.

Blog Posts tagged with "Energy"

What is Light?

“Light” is a particle (photon), that acts like a wave, and is understood as a localized vibration in the electromagnetic field.